Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fc4ffe7eb0de4e…

MALICIOUS

PDF

96.4 KB Created: 2021-08-03 20:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c9acbd83ca4cb0571281416df4efb44 SHA-1: 6b2c25954eeca815977306a93f215840bcdccfe3 SHA-256: 79fc4ffe7eb0de4e24fc68ad7f63aa7f86822ab019450f6ac6dcc04687d0c6ba
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://cructi.ru/uplcv?utm_term=ews+certificate+form+in+mp PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb66311f6---dufewezixunonanobis.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fa2ba0153e81763d0a70f8490d1de212/97583983372.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/75432258663.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e17d299a55e---lijak.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af3bb5fa0---99790768976.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4837d818c---48551387708.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7ql9dmuk2g55h4gb5q62q3hluc/jexebodelomegokoj.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/81ead018dee8add35dd018b6eb66e1c9/pedevafumesoruwej.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/komegerupamobavegenet.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991207526a---6683007624.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dawewunutuw.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/xevejutagajidosaj.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0ad8ad61ef68e15efe2d2cf1b4c4e165/golig.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bee0811aff9---84954112419.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eap89nu0lmepbi1scdivindmas/81629820446.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d006bdad9870405fceb9873c3037e647/jomanule.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/sisuvosasoxunaxine.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/32178465043.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/69751230392.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/933acc148a0e48caedf82633fd40560a/bokivexevad.pdfIn PDF document text
    • 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_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10664 bytes
SHA-256: a05aa414af910c2272d71765c6aca64e099eb53b981b4b3109551355eeb04b4f
font_01_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457F 17732 bytes
SHA-256: 605465f495202a6cfa64d600bcad7a83bbd6735f0ea2a652ba4e5ad182b10bc8

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