Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f42d5e23f5adfb0…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d89dd55d5aab232a7e82c5a020e84ed SHA-1: 198ac5e222d85820c81e88ad0f845dce700dd6b8 SHA-256: 4f42d5e23f5adfb01f77ed4dbcb17c876589311a5983bc9ca82f6a6ce148952d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document likely impersonates an official notice to trick users into clicking links or calling a number. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=income+tax+pdf+password+format PDF link annotation
    • http://colorfusion.us/admin/images/file/dopigewatunirasesifaruto.pdfIn PDF document text
    • http://short-story.ru/upload/file/muxovu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/88aea828530e67a24a1c91c7a7850bf8/94096463528.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57830425523.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h9tr67ast1msrp1lj1beq8m15c/wuxawawojo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dokozagas.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5df4e33e---2840457529.pdfIn PDF document text
    • https://okazionche.com/files/70293377662.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b329655e91e---30675377097.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16c36dd09---berazokizu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/55a492895bf60b5d1ff3a46a33abd692/47434263733.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6255a271b---nugalizuxa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d2d514ae---98160426212.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc3212339---21276645953.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/97305224456.pdfIn PDF document text
    • http://northcity.rs/slike/files/77644652183.pdfIn PDF document text
    • http://fxmeat.com/upload/file/fef3d6095b97b92ba7b2c47f522fe8a5.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f708570e6faa40f3ef7d140a7f1856bc/45097317122.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/eae4c05e47d80c7716763826540a1545/lajafagudaw.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/57542246354.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65209666651.pdfIn PDF document text
    • http://stylekd.ru/files/pitubenoxaruzinenoxodo.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/241456143.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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10780 bytes
SHA-256: da05d55574e151004126dbddf9c08227db06391d82455aa7b5a87caec0295a28
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 17040 bytes
SHA-256: 9c7925f6fc1e3693734336b65ead72a7283f66866642b267965fb298840e6671
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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