Malicious PDF — malware analysis report

Static analysis result for SHA-256 487c643a146512bc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 10:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 023fdaaea4e12629f30803a2f2a66c82 SHA-1: d58838e930eab5639b83f83c80f5cbdeef3c5850 SHA-256: 487c643a146512bcdc730a46b03fef872ddafba4fd83a3ef6ec3b76e32a613b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm suggests an intent to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://studioaba.net/userfiles/files/wixomagisoriti.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e3bee6569628f862dc14ca2363195d63/lixusiduzujuxuxazuzefon.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/46755556230.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/80309625040.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/lufafukoxo.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210629161604_b8aeet.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/moketemeduramodutadivibo.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/mumadipofire.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/gulobalebebolawuxab.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/55be932519df633e3e2bc6e7106f4389/xaguvagasizasol.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/kesuwusas.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/coktrmj1tjnsntnjpuiftq7m10/petareloririranugemeloxe.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118dd34634bd---befewofovud.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/93646464591.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hcbl7modrqch30qoolav4r8b65/94352439856.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fddbb2582ab---80832007464.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/mawuvutapimafa.pdfIn PDF document text
    • https://viettrungson.com/media//Files/89781327910.pdfIn PDF document text
    • https://campermagazine.tv/public/file/sajolosezetavazorerekopuv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823df634921---xuratukowik.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/39090224385.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/dujakosuve.pdfIn PDF document text
    • https://isosklo.cz/uploads/63377063614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=waterfowl+production+areaPDF 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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 17164 bytes
SHA-256: 84651789b0d60c8d838d4d8bd8dabadf674fa4d46138a7c6c2a3883feaa3522b
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 10624 bytes
SHA-256: 399aa3df260423fa19392156facc76ad10496dcd3a96ad7c5a13636c1dc2541e
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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