Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f877880d0171ce1…

MALICIOUS

PDF

124.1 KB Created: 2021-07-22 10:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7ff5a3d8a81554cdc3f3daf71d65091 SHA-1: 1221a244583202e2bfc311e80d1155582f977b4c SHA-256: 1f877880d0171ce1dc178363ea96c0abd38bb0e271a8a07a3f8ccd15c0a52007
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zkojicin.cz/userfiles/file/gokawexilugakun.pdf In PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b8c36b18b3830ade1477fc71762a2c70/53575495776.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4da421de951fb6abb41492a192332d45/7031535253.pdfIn PDF document text
    • https://airshow-bg.com/file/fadebijiv.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/kavawob.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/rixefumodidujimubolemuj.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ca8i8tlf5fk8b7js29eoustd50/62257035662.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0a06bcdc043982fe504e75422efc977/40349281667.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43d05399c---84657817890.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c5817080a97ed875451e385f14e069c3/jopid.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/89591599607.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/deriwaposaxawa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d43d3a69f---33745269650.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zobodivebewomisepa.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/20647491471.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2607e69348e32107ca03d9a36e77c998/11624245964.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece76ed386---59904734026.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/44743530391.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54acdebb48---tujunu.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/jufofetedupaxonetixeseza.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/54746869222.pdfIn PDF document text
    • https://tavio.ru/files/file/37960903179.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/etp607on417eoo8d1tlhfn0n0j/benuvarijulisekuf.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ce4d46ab2aee53da5fbf83b17537132c/53429334911.pdfIn PDF document text
    • http://praguetransfer.com/files/file/60313740928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kind+of+frictionPDF 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_off000181f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F8 9952 bytes
SHA-256: e403714f1bfb442515f0d2a1ada15de85d39bbea28cc63c7ae52ba3ff7e91ebb
font_01_sfnt_off00019800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B012 19616 bytes
SHA-256: 5b8ba415decfe9d2b6ea331f86756cc124b8294b7bffadea04fbb29c6f6dbca7

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