Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f79a8816c6d445…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 23:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b10f5afd1b9fab1dec92ff1a62aa3d3 SHA-1: 1589c03e1096fd63ed793619b0092520256c407f SHA-256: 62f79a8816c6d4454d6bb53909965c9e6b6a0870ca94d29f0ce2a757e1c796cc
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests the primary goal is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=whirlpool+electric+oven+akz451+manual PDF link annotation
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/zodozazikixelujemugutega.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/0de1e74b3e8f5b1a152f45a3483ee036/80152511624.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/27648027690.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/xofefapolexonusizunesine.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kimabomafuwalikiv.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/25721179372.pdfIn PDF document text
    • http://zzquansu.cn/d/files/81291870404.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/34894165898.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xumakegen.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/33744a1a5aaf3adad31fbb358f57158d/20548912244.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82536369356.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070953e93347---31291128043.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/37052a1dd37051c0f42627fbefd7d2ee/47507659888.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/caefaa8a3d7bddff235efc187ab0cb0f/1180524870.pdfIn PDF document text
    • https://btegypt.com/file/45390548930.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/zenuvabifuzaxawegoloteki.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/sudotof.pdfIn PDF document text
    • http://aplus.to/userfiles/file/5395061487.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/48437690152.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36979181135.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/tirazamejizimoviko.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_off0000bf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 11048 bytes
SHA-256: f3dfa36cdd617b9d29320414f22d98a6f182120d88b84929803d93ceeb5c348f
font_01_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 16912 bytes
SHA-256: a638e6763edb32fff714dd6cee8c7d01f491b81f98e3c5ab0286e2af52c0a199