Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de88b854bd11943…

MALICIOUS

PDF

94.4 KB Created: 2021-09-07 03:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dadcb0fe792d8d5951a9199c81ee7607 SHA-1: e8b56321bf4b97ffa2d0a92c1c4d527500bfad1a SHA-256: 0de88b854bd119437cce29dcfcd78eb403ead2969cd9716a224b1f6f79f855b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious payloads or visiting phishing pages. The presence of external URI links and the compromised CMS upload link farm heuristic strongly suggest this PDF is part of a phishing campaign.

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 https://chcial.ru/uplcv?utm_term=anthropometry+for+designers+pdf PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b099a03a0d---mukarusujegominojusopase.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8f10a647ce67f59de37f046c6951e8b7/13488930839.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/majaresi.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/fonanudoxuzivajesizelufa.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/20538437033.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rafovipuletawiwixu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3adc032754b01943c03996d49bec4060/12092740902.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611aacd82054b---lodar.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c06e80ca8---mulamefinuzavufipedu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/10119990838.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/29306966038.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/setigekozejukedimono.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/firiripuf.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/bejazumufadogogiverabudo.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/lepikagoragikofipif.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/nuxefunupidijut.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9c9f213f034e1919c83ab8a06593ad3a/walabajodefa.pdfIn PDF document text
    • https://limmaginebistrot.com/file/gemupamigetafunutopefi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6f495268e0ca765bc3ad704f01ce167d/zukisokusanujazijelew.pdfIn PDF document text
    • http://gibisch.org/files/files/81554265616.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/lijinojuvixofug.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b5de25f56---81863657108.pdfIn PDF document text
    • 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_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 19156 bytes
SHA-256: af918adb02d32822694f405a395122fc481e9f6c6469eb72f2a6b07d1a50c4b3
font_01_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 10832 bytes
SHA-256: 3c45ceffbd66144dc8b89302db9ec47b2853f231321f10251c7e3e5c657e8d76
font_02_sfnt_off00015522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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