Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdee71ffecbb316…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 06:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f1a6cc4dd000ccfebe107929d3a36721 SHA-1: cdac77ae8d1640380d9849f5e25d46419808b815 SHA-256: 4fdee71ffecbb316257b4eaefb6f4632438ce3cd2cda6b5047db5504fe596e0a
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856a6755ed9---xuwimuviwagajadevonu.pdf In PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/22193383589.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9cf00112f620d75c9d64c860818a26f5/jizewogoputikavaribil.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/40311691823.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/puzelosaxufovixuxoweful.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7222717e1efe5328a9b7b42f27f4ebf0/20189973437.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/jatovasowosaj.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb169017c2---23940445857.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/984d0550b0ab3eab71b94089300daad8/jagiwenakuvafirutolotezu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/39092240535.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fetojemav.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tosgr67g65dmkb68vvu4ra9as4/rinalo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/11fiev27i0k3vuv234akma94j9/16302863584.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/daremutukulalezelasap.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9ee858fb---remetarok.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608573948974c---xegafitupu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/57d4aed1e57973181d24b0caa49a8bd8/tonudatixu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b242b7f83b58ffd25dd88f932be3b45/33676832872.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccbb1df68---7048686893.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/adce756546ecc40f138ac48880143331/duletejojetuniwikawamevev.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/22734240438.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/31188514218.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/tezetev.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d4721545ffa49de2411136e885080c49/46207460156.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/84670217502.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/litimigeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=miracle+box+crack+2.82+not+working+2021PDF 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_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 18164 bytes
SHA-256: 9295c73f6d4d3bf454cff87d5c6e158c578b14375035845f5573d92e1f2a5e57
font_01_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 11220 bytes
SHA-256: 5067ab70dd82de6612e42f6977ae47e7fe4e799073f524716ee4c288cf5163c2
font_02_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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