Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c787ee2d091eb…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 05:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 238bb4ae4d3c43d7a22607b4d18050c3 SHA-1: 92a8640881c579336132e60e1b7ac601e7a08a9f SHA-256: f85c787ee2d091eb3f38f2cbe69d7a0b51f0feed242d2db9f4b63c16e3d4199d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=psr+i455+manual+pdf PDF link annotation
    • http://xn--h1acbpobggs.xn--p1ai/data/files/16601908521.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/bulelunebejuripamavo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/fibarakadomupuvedomut.pdfIn PDF document text
    • http://ijfbn.com/editor_up/35448594026.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20217241228565019.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87d3e0369---12323010438.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c174d0fb2073abd29715adbaf1591acd/detiwoganezezumurifek.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/jigixaj.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/12446744651.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kopepedinoxelev.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbfa90a726---65777750860.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/42448241621.pdfIn PDF document text
    • http://1carl.com/userfiles/file/nujafalipomere.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f1e6aff8710f06ee3a5123fa5be1a5b8/mowesoniroboniwajusagan.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/41611966988.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/56635677733.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/54223320967.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zumepamepamivufosobozi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b826f87c88b---77618109882.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/dumojija.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/87617853312.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210804/16280352571989.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_off0000b7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 16184 bytes
SHA-256: 0ccc9f7e3f252ee9010863e88e8790c9b189e200c3008eda68a1946df649d88b
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10624 bytes
SHA-256: 63f6417e4ff0083464580da8d6321399e3130d98cba8beae20597d7b8d54d5b5
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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