Malicious PDF — malware analysis report

Static analysis result for SHA-256 240d269d088872da…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b647b9199e72efed2385111d9f1a0248 SHA-1: 6ec55614ce388bdaefd5b6f37500bb91e9347d0b SHA-256: 240d269d088872daf0fa2be1c8776a6d9c00f9d80948d2ce01174b0e53d4775e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nguyenhungstone.com/uploads/image/files/begifolizisevunofuveso.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/3546345912.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/21359695046.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/10715635377.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/61068889697.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/86758140981.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c285b904e6817bc66ccb6afd456c4fe2/fadaz.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/vozofefikog.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/denaguj.pdfIn PDF document text
    • http://healthywithhart.com/res/file/65578246063.pdfIn PDF document text
    • http://watch62.ru/files/files/vilixiguzozizug.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/biraxorebaliz.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/40970476536.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/38086691795.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/389986646.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee32abd803---43950759515.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/53681825906.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kakepililovoxurumokununa.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/sipibitif.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901094954381120.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/50502583270.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/tifapisawugimofodulisol.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101600347596.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1a934f9e54758b9d38f0b0d0c166537e/renivifavafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=she+will+be+loved+chords+no+capoPDF 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_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 18136 bytes
SHA-256: 20fbe3e600e4314a9f2c1c57c971404542cf31072a2eb829279cb817111ab595
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 10880 bytes
SHA-256: a0471ebd07b7323bd3df0471771a16fd1ca365aefde434f480ac006d26a08f7f

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