Malicious PDF — malware analysis report

Static analysis result for SHA-256 9835abe5a629252d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 06:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38c29485f4f7f436b40f8ff8e663ebf6 SHA-1: f14dff2500e6d38e20dd695a8e09353aa84c5615 SHA-256: 9835abe5a629252d7a50bcb59082f7664d95e1c16ed13f38a146cbc2def554a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm characteristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://hzqzg.com/d/files/62975733771.pdf
    • http://ha-sine.com/d/files/bavijowuri.pdf
    • http://sangjeom.com/userfiles/file///89284196705.pdf
    • http://www.vegagastro.pl/upload/file/mujifizewezubaga.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6ba44942c5519bf34e34e005ac8778da/29980644932.pdf
    • https://ms01bet.com/contents/files/nowajudoretitu.pdf
    • https://zebcom.in/userfiles/file/xopudatirogikaler.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rokugun.pdf
    • http://goodlack.cz/userfiles/file/muzuvuze.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/73114248484.pdf
    • http://mindentudor.hu/userfiles/file/bemiferenawovibudusibuz.pdf
    • https://interativacorretora.com/fotosempresa/files/39089049800.pdf
    • http://dulichtantai.com/files/uploaded/files/xolek.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/70958558071.pdf
    • http://chinalabware.ru/d/files/99203895110.pdf
    • http://grafitym.kz/files/file/37712102488.pdf
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/sesomuninilo.pdf
    • https://isleo.com/i_photos/file/sezirusakabodokatemavo.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161516e7029cdd---97615671866.pdf
    • http://www.radio-kum.si/data/files/kudenosubatovegekeze.pdf
    • http://sinocelltech.com/filespath/files/20210912030100.pdf
    • http://xlith.com/userfiles/files/62948780445.pdf
    • https://profession-your-dr.com/uploads/files/202109130234116143.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16142244e7f383---27325013901.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=streaming+elite+season+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae24.bin
9da6bebc72b46dd99a82abf8c9fb8583e733e4988015157c66555df314fff6c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 10604 bytes
font_01_sfnt_off0000c65b.bin
9cca8bf68f4af77f5e71f098f14c88f17dc8dead33133a99e753274cf70afb28
pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 14132 bytes
font_02_sfnt_off0000e9b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 16792 bytes