Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d03127a4eae78a…

MALICIOUS

PDF

96.1 KB Created: 2021-09-06 03:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43e92220bcd718c0b7d55afdb1f7af97 SHA-1: 72c9d5fba2fe780cdf24a49a036ca855177b240e SHA-256: f4d03127a4eae78ae07acf00ad86fa061e9368a7bc7b3713a26a8743caa2b01a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress sites or hosted on disposable domains. The embedded URLs are designed to obscure the true destination, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://dpsszczytno.pl/photo/file/93251219659.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/1cadf04b14e124b3dde5cc7a07b3dfb8/30572573628.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/70983656069.pdfIn PDF document text
    • https://jobtiara.com/files/files/dolidog.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773386b9f4c---91786665649.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac31626822---safigebozane.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9871d4606---67467289133.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xogupenovisenonafefuti.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/9118208269.pdfIn PDF document text
    • https://ksuskalology.com/images/file/53255183072.pdfIn PDF document text
    • http://renovator.cz/files/file/98473753620.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210626045628.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/tevokapomenuvuxibe.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/jetivexabuxixemanujugukaw.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/vufikas.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d88e5dcedd---majazimobonevusulunuvuxo.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/55873298244.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3982d412---33666388683.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/faeb574ffb40d07b7e94d1936798d4a2/dowawus.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/bojidopize.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mthfvn4e6fsrl9cumcbjdhdn39/jaregugudobanopano.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zopijovekajamogiwodabuz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/puwerapevabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=climograph+worksheet+geographyPDF 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_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 10920 bytes
SHA-256: 29cc1cb933c9deda494c495bc3f8fbb187a35a0e7e41650040e69cf8eaa780ef
font_02_sfnt_off000142da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DA 18420 bytes
SHA-256: 7c3441a79f7fb5fe5994f58e28e8dc763c09c4e15a63e6110dad783544e57c58

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