Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b2eafe748114fd…

MALICIOUS

PDF

104.2 KB Created: 2021-07-02 03:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a6ae100ff241de81c21b118a0c95e34f SHA-1: 77026ccac9e3d900cc6f9a5f482a97414e193483 SHA-256: 67b2eafe748114fd247c260402e9e798f818842a5f2b47fe4555e04dc9399169
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits multiple indicators of malicious intent, including links to algorithmically generated URLs and a link farm pointing to compromised WordPress sites. The presence of a 'download button' lure and instructions for a password-protected archive strongly suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9fb18c763a4446e1d13aafb687bcfed2/vajeniwexugipudoge.pdf In PDF document text
    • http://beiwendq.com//data/attachment/file/30083193798.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/69820903923.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d517183493---4860929846.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/89182638999.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd03784b58---fuvuzuralal.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gadoruwonululapi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3c676c65fd8a27f945c9a204ac90e45e/25911374573.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/92577535798.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/kakegopipirazawu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57c2ccbf5---wekogavuragokimatopes.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5d64fb27a35702200add856a3d51eeb7/5326501136.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878ccd7816---gagagetisi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609362a1754a4---80916460546.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca75ae275---megafeworugemitowi.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/mobeludufukek.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde5eaf18d---xosizuma.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/2938176064.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/02fd10e17b82587ff1bbe14c97393cfc/damapowelivijatan.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/49624347012.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/13837339230.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec151ad73---lelusibesofipinikojipi.pdfIn PDF document text
    • http://berbun.com/user_img/file/91959736756.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e9e7d3e23e688694687e76afecddfa4/levodukavubiz.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/87551791472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=halo+ce+free+download+unblockedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 29068 bytes
SHA-256: 8b7369f215abd3f37ab2fa2a5951df3cddc75d6985e1367e3a4a35a25051137b
font_01_sfnt_off0001615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615E 10520 bytes
SHA-256: 231ae68fe2e0553915c548818a164ca39b666da6f0829afaa8c3bcf92ccf6d2f
font_02_sfnt_off00017979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1