Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac151864e917c35c…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 11:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9e9247cecaca6ebe67310a32373595e SHA-1: 2622679109762344a038f172deb0641d48155804 SHA-256: ac151864e917c35c025fb226ca17ea7271e3806505172905ae2406103b0cb190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

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://philabc.ru/uplcv?utm_term=can+metformin+cause+you+to+be+nauseous PDF link annotation
    • http://myphamhelios.vn/luutru/files/15335849503.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/18003893004.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/50897639176.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/70634049856.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5d66805f---ruzuzamobiruj.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/guzoxet.pdfIn PDF document text
    • https://red-adlay.com/upload/files/31224359339.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/zoxukimowabunamevapawuved.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/28880561531.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xuvukasegalozekebubosekuz.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/95664895198.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/50031976268.pdfIn PDF document text
    • http://zenithmetals.com/files/lavazowulovosuvumel.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vifilafawufolijolawek.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2b9b3313989eea522529858817ab9876/gazusadefelotemeki.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1530fa392e5df845ba0f0bcfffbfb6ce/99661580468.pdfIn PDF document text
    • http://aplus.to/userfiles/file/91121353596.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099fde988795---15728775638.pdfIn PDF document text
    • http://st03.it/userfiles/files/69716933803.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621385959.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/80797604449.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16211480080098.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3f15a5a2---siforapunoxapujugodiju.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/91494582741.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 17580 bytes
SHA-256: a645d5daeeb27e03fd9069a198c7815b9199b3401897254bfccd14e853c864e5
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10836 bytes
SHA-256: f756d31c038ff690a381557734ff8b88320d9585a38eccd7d8f920a65f5a3cfe
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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