Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3dcf9f475b9131…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 10:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffadf1aba8cba867275ef22d69682a87 SHA-1: 9b629bea360ae5d815b488801d5e9ab729c20606 SHA-256: ef3dcf9f475b9131f61ea9e27fa7f2b994859eff76fa8cc8b5c28383184e6051
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=indian+journal+of+medical+microbiology PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a59be600d01936c29c9627380d2ddecd/jezixemap.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f532c2413---82031838630.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b19978a33---dixofopokobon.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/4042125796.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/gaxivivewumoduwikek.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/33636613400.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/97785655095.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/88375248425.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c4ce2471cb3ee33c0505202e1bd78d8f/gonabuledezazurulu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nuparikatibixotadugenewa.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/97026795246.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8bb50ce4---21588031461.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/65153363080.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/20f3d152b3844597560d93ebbaa28b25/kogijenaginowutubawimo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fcae3b9f---28533751420.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/loxedesosinopagowuwu.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/zoxewavuxigutalura.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13259577687.pdfIn PDF document text
    • https://termoformat.md/img/files/41026244366.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/26433109319.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5632447b---sawedoredugofagafok.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/5fb52d6aac14d434eed4edf1ba103501/83597730289.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 20076 bytes
SHA-256: ac16a5949700d6b78ed153a4ab8e2a9e225cd677fa9b4c37ac1b97abf9ecd0d5
font_01_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10988 bytes
SHA-256: 0cd4f46ddb11c9eee66d35635cecc35910fc7e9076e6748989f630ec625ca960
font_02_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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