Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ae1d3d36a13495…

MALICIOUS

PDF

89.9 KB Created: 2021-08-08 01:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: db87af0195474908eb4977bd30f7b522 SHA-1: aaca494b4f5ea580ce17037020cc7ce1e54b2032 SHA-256: 02ae1d3d36a13495604f5fa4615f00d055d949d543d20ade8e2cdfe72d40a7d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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 http://shukokai-voves.fr/userfiles/file/maluxapevivu.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/71003099794.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/35403315681.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/57298080760.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/58570116670.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/67521541965.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b823fe99b74---tiredoredo.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/75342984358.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wazozanixonataweporapuda.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/ca571da20cfcd7ee974a11dcd8943d18/tunalodod.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6db6cd25aad6ebe50755da619f59c5ae/nosimenive.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/97195572250.pdfIn PDF document text
    • http://inercial.es/uploads/files/42785621682.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/podakogimufad.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vuzeka.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160820ba6cde96---sumaguzajubizikal.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/bibet.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6macos3k7esetgfsn9rh2vjr9u/54121445181.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zitugule.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/32358234322.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/298ae55k2dpj86gr8grnn1qha1/84908060968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bmw+navigation+download+freePDF 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_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10732 bytes
SHA-256: 95ee2ae931105537536c5f4465f32f37cc6b34c9b7c7116dda0b9b8554221096
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 17436 bytes
SHA-256: bd5c8236a97d3fde3ab3adb7fed747c62de4861ac7117edbe03e5896b514a30f