Malicious PDF — malware analysis report

Static analysis result for SHA-256 324ad8f28be92458…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56d645f9ba2ca0d6c3892dbeeed23759 SHA-1: b14cf1a4047ec5842304c2e0451e7e05b852b4fc SHA-256: 324ad8f28be92458da0fc340ae370d7c4da55a96827271c44327926cf841efeb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=fifa+21+obb+data PDF link annotation
    • http://tiga.co.th/ckfinder/userfiles/files/42504674971.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c79d7ed4c---niredomomisilixofimejafu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16148be8e6f613---75485581047.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/xewomavavuresuzop.pdfIn PDF document text
    • http://www.og2c.com/images/file/watiremoki.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/dixipadimitefa.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/29479758780.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xupumekenovowedapimujiwux.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/79682479861.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/94695575769.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109040033489354.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/fazexekexelodet.pdfIn PDF document text
    • https://codecs.ro/images/file/82861860512.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/dipixibekozod.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/zazuxadejo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/97o30ovih1jt8g6pkpqj97iobd/betasakinoragepojaju.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/xigivatutefij.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/96571551936.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lukogamezexobuwozidisezu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/soremawomolegabovop.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c24184841a536b338a07ad906d561c43/70019579268.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/40107596518.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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 15684 bytes
SHA-256: 91d629cd27cef8d43772e627c59ef7b77d526cdea10ffa477e0e7f4bc7ed217e
font_01_sfnt_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10088 bytes
SHA-256: 7ac8bf4cb24e6a4965bf30cd9754637cf942d166db7d51b8106c2b9a2aba64cd
font_02_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1