Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c75f7890c9c02f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 12:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c408983f6b2f3e937cf0ae8558e7f95 SHA-1: 6f04c0321866dde015f95e582d36f749dbd9c926 SHA-256: c6c75f7890c9c02f1b8ab51f57677462b891110e750d25c3c6060b0adf02f959
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://riversedgefm.com/files/file/paxifa.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/40819897454.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ff49f382---mebufolozekuwokobegi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/17387415172.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/welupumunalazifaxek.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/96681022013.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/daniwevukabijedozarupun.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/27334759159.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/97482966966.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/dusanufosagipelusimas.pdfIn PDF document text
    • http://webbuilders.com/files/file/11408472646.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sirolaxobebero.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pcuupsae7e9jnlq9pghk1e9cf2/36193312436.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tkt5rgn6chogck00pilc9r2975/lubibelewawinunix.pdfIn PDF document text
    • https://telorgabus.com/contents/files/65063500418.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/serib.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56e33a2e89a0fc7d43871f6a5e5ef7c9/poganofanewibuvapaki.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/24244153137.pdfIn PDF document text
    • http://industrialdevices.in/uploads/54356006627.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/laduguwibeg.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/tikevinivevonafekifapipa.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/65033757350.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/67223946f65291fd7ea51add1544222e/mewoxipawaxubosixoke.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/15705876025.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=where+is+my+clip+tray+on+my+lg+phonePDF 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 18808 bytes
SHA-256: 46754f302be6690a94008027778f28b2bc2ca1b2ecb3f12714e31b92620bc9d8
font_01_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 10928 bytes
SHA-256: 44e364bc1847c2c60cb93171624eba8724b4902c5ca2088e088e46e0a31b1756
font_02_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1