Malicious PDF — malware analysis report

Static analysis result for SHA-256 1add4f5e1b1f9fc5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 16:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c8205870db201adf09d6f1b101c860e SHA-1: 8fa7240ab48e5f3830397ea992f2ef078453dfbf SHA-256: 1add4f5e1b1f9fc581eb1d263ca3f0cb6a3651ee13443b009ce8a6f5fa3d5051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=vishnu+sahasranamam+marathi+lyrics PDF link annotation
    • https://at2-turbo-j3t.com/contents/files/69940045436.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kefavixe.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/3075402289.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/6211744226.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/kisufebuv.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/xarutobajogum.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24346097571.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624510b5c8---davonunanuje.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/46592555613.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/17625777663.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1775ccdc---sidegupezudovawo.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/81015817901.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e503474fa83ca1f6b587c87901fde32/tavatijitunutono.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/zuvivenipojex.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/18670603223.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/868c88613084d1cfd7bf8fb129952cc1/dubuxomirejofa.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/saworukiparagugi.pdfIn PDF document text
    • http://rideco.hu/upload/file/55834525954.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fuzuzebokexa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fefe0cd2f2---58690200195.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3382cbb2e4c9d179439397e2f2ee4654/zamiluzolovopakaxijunetan.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/25243746083.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/gazared.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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 19364 bytes
SHA-256: c27a1bc4a7c71fe5270a95e40d1f1b616aaa8c001a36302cda3c748f60e66992
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 10424 bytes
SHA-256: aa8af88e09ec2bd17c1260775b359f1cb5e0ae149a3534756d9d117b2f382ff8
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1