Malicious PDF — malware analysis report

Static analysis result for SHA-256 642ef7936e1e1cf3…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 07:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9595af15b76c0001f2b1c76143cebb8 SHA-1: eb6a205576db41aed0792266f0beff9beb1040c3 SHA-256: 642ef7936e1e1cf3b7416aca946554aeba1da6648c951a73ac5c72f9b5a7b9c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were extracted, the structure and URL distribution suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://amadpich.com/userfiles/file/poxaropagazepo.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/467n2b4o4t07negd7rm0lquhu1/pevuwitilirol.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d05b0a11---kibasonolatibitesiroxoz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/de58390407058cfb3fb7d2271baddd48/tafuduruluteb.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/22143120747.pdfIn PDF document text
    • https://bloomeng.com/uploads/mibegapeluwesakovuxaserut.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd192d3d898---vovutumorodopasixolofe.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/27017559192.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/xutinosujejetuzobinepi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/dccfca88b89bdbe1fa7f35d95f3f3497/lirebegemes.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/turikemexotavuwagewa.pdfIn PDF document text
    • https://businesslife.com/content/file/9697590474.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/wepomemefegedomerusavov.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050109195738.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/88a4edf2424b1a78b8e02ad6fdc6d9b6/vajogitata.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gqbffu2b7cegjmgfg3nuulll9h/vuxodipudowixat.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/26594010761.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/2334218908.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/votolapalefunanebilofuj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c625a20fc---bodum.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/45434364566.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed95fe326b---7749263385.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755c7bd8f9---tojifomewa.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/cf8059e505c118671458dcfa95de658b/lapak.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ebb3caf0---13645601657.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5d09f3c6070c950de0ced6c554e1ac7f/93439588856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=all+the+bright+thingsPDF 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_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 10224 bytes
SHA-256: 9dadcf4b269d1c3b011f11089bb9504a3495644f8e49d771c3dbc9d122b52311
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 17764 bytes
SHA-256: aa70bf9951b30138f68c8316cb5f395e66b6dfd03cd228156e2f40df9cebf75f