Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f6ba2468b26bbd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 15:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed11cc3bd2a7bf43b965e26b69ece215 SHA-1: 597b80a2186c4f90efa51600d98e81810e21f27f SHA-256: 97f6ba2468b26bbddd0bc4c7bb79057067e27a237a1a5669a0bbfed53fb750cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://xenangheli.vn/public/files/44667832898.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3c07333d7c6c9013c5f2cb029b7838bb/fokifigadigavadurewadimi.pdf
    • http://anpo.vn/upload/files/89570766090.pdf
    • http://mobil-tech.com/files/rulozegopanefogov.pdf
    • http://statsale.com/data/upload/ck/files/jalojapejugujij.pdf
    • http://schokoladenfontaene.de/idata/riremebenoratuzav.pdf
    • http://zafirkort.com/uploads/files/tomavanuze.pdf
    • http://safetruck.gr/images/file/56015910139.pdf
    • http://managhantasala.net/mailuserfiles/file/64613283380.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/fukowizukos.pdf
    • http://spain-ex.com/images/blog/file/39071146212.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/27723151022.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca1cef1b0---sepozavevunedipabisasa.pdf
    • http://parateam.cz/file/54456945119.pdf
    • https://rabudiagnostic.com/userfiles/files/nisinepapoxodamawezez.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mewupaxabibapevigebejabub.pdf
    • http://gaudi.tw/upload/file/jojilemovabu.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109061721506875.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/wituxuveko.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b6604e4c---bogijivapogaturi.pdf
    • https://zerling.eu/nico/images/files/41231718447.pdf
    • http://nemochem.cn/upload/files/50686735862.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/586tieb162bq1csgfj2dvgldqq/zigojexekofavejum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+gba+rom+ita
    • 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_off0000cfd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 16792 bytes
font_01_sfnt_off0000e7eb.bin
5d8007bee95b59914c0a50002f490ffc8ba6e41c63f57b67caeb1480fb76f028
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 10472 bytes
font_02_sfnt_off0000ffb5.bin
2f06099aae225e9648b72f758960004c03562031396183f4e9b0661bc8764843
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 18868 bytes