Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c90a8e696314068…

MALICIOUS

PDF

94.8 KB Created: 2021-06-25 17:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a258cf64098817b9f44022c632e39bae SHA-1: 1b8d3215360c437dfa2714f3ada7ac7fea7390ab SHA-256: 0c90a8e696314068b4ced92a8913de918ca4750ec3a61cb820b95a30361f1fc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or engage in SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e69ceed4b---43548363247.pdf
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/17b23024c12fa2cf6e140e77912255c2/xozudegesopetolemo.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/wazuwawab.pdf
    • https://geneticapanama.com/userfiles/file/pirifinuredavosawupeku.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2ccd6cfeecd39b24c088fff4c798bc7f/92728178131.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qticeeb5gn5ne2bnrnrjaivlk6/kitutadoromewepizogizowob.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba20bc4ada6---41534366974.pdf
    • http://bezpiecznamlodosc.org/files/file/61741248934.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/zomig.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca036a9de---18038839362.pdf
    • https://temahr.hr/files/49537076380.pdf
    • https://alternativecarrepair.com/userfiles/file/luxeruru.pdf
    • http://curry-box-deluxe.de/userfiles/file/67050738270.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160721437e0aa5---fidugatewo.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jb9ue6svpmgea92cr73vhaamq0/logukoxerukatin.pdf
    • https://zebcom.in/userfiles/file/wojaramegefegunuk.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac92f17d13471e3806c810e6e535d160/tirulufuxiwew.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f2be40df5bc76c927c302c5db6a65d3a/dawepebuz.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/fojumam.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/94f2d2cf0c1240a7e1fa9883c04ab358/46928044498.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd47e90d8a---90178193893.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be49f108ce---zikasebij.pdf
    • http://comp-art.ru/userfiles/file/wuvip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=construction+project+engineer+interview+questions
    • 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_off00010f91.bin
eb967f237f1de003b89ef00c1c5de698e1d9c70d470bbe69753d0f457be3486b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 10900 bytes
font_01_sfnt_off000128b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 16792 bytes
font_02_sfnt_off000140c2.bin
60b078dd9597666d8cce777f0107ba3b1b794211eb3d0d8dd371eb1ce584554d
pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16704 bytes