Malicious PDF — malware analysis report

Static analysis result for SHA-256 abae9e53c6c3d208…

MALICIOUS

PDF

72.9 KB Created: 2021-06-22 09:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 982e4e57c3a124caabb7feab046d9ae6 SHA-1: 9e7156e42fb0efb9b70ef22b7237d5aa242ca818 SHA-256: abae9e53c6c3d2083585e3a65a80be78362a67fa4329f51633f7a37e6ef4195f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. The heuristics indicate a link farm designed to direct users to potentially malicious content, aligning with phishing or SEO-based malicious redirection tactics. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=stained+human+cheek+cells
    • http://sosonomo.com/ckfinder/userfiles/files/werofopadaf.pdf
    • https://33mobility.net/uploads/files/melixalowuwubigivenotedu.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jor52jttd38unshrqh3ceb4fh0/kexero.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af7ba28fe---wuwuzani.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d935a8583df349da0ad41620fa4ab520/30463686938.pdf
    • http://k-ookuma.com/js/upload/files/faxalokupurut.pdf
    • http://tipiland.net/upload/file/23011575436.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079a14e55129---55434814047.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18198937c3---gupufasijaveganugofure.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c71d6b25c---63404343416.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3hurkj7r5l9l9sf5sdb47mofe5/45827986946.pdf
    • http://krevue.cz/UserFiles/File/lurasa.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/053216933e36872b073684c0616f4449/xakoxogeweborabegisise.pdf
    • http://atek-ent.com/upload/file/kirugikolomifubexuwimorom.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978793a4935---31704096315.pdf
    • http://arslanemlak.come/file/40744874966.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd32.bin
52d5c862674eeddd843492b15288ea5586ef1ffd4d768eb3a5b14280c4d7a409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5252 bytes
font_01_sfnt_off0000eee9.bin
691835bfa4cd5da984e130535652fef585c41a20060c0ec52441eb39fcf40048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 11288 bytes

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