Malicious PDF — malware analysis report

Static analysis result for SHA-256 92843d1665db1cb4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 08:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 712a4e0d16f7bad2698a96960c7dcd24 SHA-1: ce74c0b2b8aa71643229022f1c97f7ca5c097c10 SHA-256: 92843d1665db1cb415e8d9ee1aacc7374ba81ec1047cfce481398c2c2e539be9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it's an image-based lure with a click-outward action, typical of phishing or malware distribution. Multiple URLs are present, including one pointing to a compromised WordPress upload, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=god+of+war+app+download PDF link annotation
    • http://gradn.ru/uploades/fckeditorfile/55181835781.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/ketunanise.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/xozixexeraruz.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322deecfe96---wutaxa.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/75592455889.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/katevakexuwifog.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/73288756488.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/6969022578.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kedazesimewufuliveb.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/babasafadudurisipojaditex.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109210522456494.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/53003014555.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/49844749044.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sefisagapiweferuzoge.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/26139976778.pdfIn PDF document text
    • https://blugarden.eu/file/26490618209.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/mepakusiwazajejir.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/kinafiveniso.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131afc4a3f70---lirevevumomug.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/dolafujexinumowokebewivak.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rpinf7irsl32si43simk268pef/vijudazesemavosoteju.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_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 10128 bytes
SHA-256: 8827353935ecb80bc4c20c667068c9622748d73e432cf42918546e45196d61a3
font_02_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 14520 bytes
SHA-256: 8e722aa687f0478e2f1f4379bc0f7d5f8645542468442ccdffc7f721990d8e09

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