Malicious PDF — malware analysis report

Static analysis result for SHA-256 418f4f6e6fcb0a5a…

MALICIOUS

PDF

80.9 KB Created: 2021-08-16 04:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dd33630694c50c16f5cf4a69d1ecdbe SHA-1: a6580776679ca65cded14afbdc3e16be7394f23a SHA-256: 418f4f6e6fcb0a5a4a303c92c23f4bc8724f7314b3a87ef1dc34269c29c0b023
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=test+de+los+7+minutos+alzheimer PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9c679bb15---robewetojazawes.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/94882153581.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/12565457319.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/vilabomodo.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/90423792461.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33895891195.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3b8de6a9---22830704744.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/239f98634f21b897d845fba1c89a4739/wukuxikinuranorevumoxuj.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/waneguwazifutalub.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c87cb5e---pinefokafigevetavarato.pdfIn PDF document text
    • http://clarasonic.com/upload/file/laronilelufojalizerakuju.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ok2juj0iqarp64agv3npd8siel/ribofimimise.pdfIn PDF document text
    • https://verner.lt/images/files/17693787574.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4176e205df568beede61aeb0eb0257fb/lifanorafilixa.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ll5pvvcf6djq06sl1efnq7h62b/2943935843.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/90326738422.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/daxadapuzor.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2bfed256---bobavaluxisawusukejivo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/degikewezosegidazerap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b96cc9b81b3---60370550136.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/nuvilozasaputeto.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6431f842f5863eaa015f6e465640de8f/ditigovope.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/fufipujemusobume.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4ffda4d5d1862107c90bd9c6470efe8d/98001037402.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 17484 bytes
SHA-256: ff8c2447a6baf143d1f9367bc5924c18b93272355ba8d8dccacde62fbb1ca750
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 10688 bytes
SHA-256: 60e5fd514d14b226aad0f3771bc043fec21ddf1dfbff8573a319e55fb41454ef