Malicious PDF — malware analysis report

Static analysis result for SHA-256 02da06542ef0198c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 21:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d89ff997ee6962b1850a488a2e2352e2 SHA-1: 9d130d9878a37df581906437dd47eca1bd76fb0a SHA-256: 02da06542ef0198c17966cbfe139dfbe5cf561782c0265689ae36aa98ead5089
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the heuristics indicate a pattern of hosting links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b898e879---sufojabu.pdf In PDF document text
    • http://gamaxmotor.cz/data/dokumenty/62764714371.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/96026300356.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c2d80b5197ea259490033a5402241bf/97560243587.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tah8e4bjcomf8vf1rifdgen9uf/donejevaboxik.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/setezuvupipokuzab.pdfIn PDF document text
    • https://orrizon.ru/images/file/bifozujamodew.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/92165470852.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870eeb1c6b4---80333623716.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/18478610782.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd454a73fdd2a3b40c296b9709cf6c81/30808723841.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/89383785576.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/lubirinonitavulewulidoxa.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/13988060987.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/90598516796.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdfac93fb5---54204215238.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb99acc1da---latatakefalo.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/42930398331.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/17f5cba2ce15a8fa0acfac222dfdc550/joloz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f2pk66lv969dl81c0onbfrpgje/dagurovaxoxuliv.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/54743848761.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/bolobigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=six+kingdoms+classification+worksheetsPDF 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_off0000ba76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 17056 bytes
SHA-256: 589b59a9df48163b790cbfa8b67576504e0dc223d35b0521e22546258c27587b
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 11276 bytes
SHA-256: 816c551c63d33c8dd3a78bd3ad0b83fdb12480c1a033ea997bb8014c0aa2ed52

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