Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc68d44c3bb6550…

MALICIOUS

PDF

71.1 KB Created: 2021-06-20 02:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45f33d638b6b7dc5da87fdb10315157c SHA-1: 2bff559fe1a6d1d1a137342e37373d9a627b5ce6 SHA-256: bdc68d44c3bb65506b6255e9e9a974562fbd35b39ca5159802284c1027ff18de
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The embedded content appears to be obfuscated and contains references to 'mod apk car racing 3d', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bancodevida.com/bancodevida/admin/images/image/file/19334062394.pdf
    • https://kermanrooz.com/img/files/47891194065.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/66pq4hl438n9phifhum3ddl6m1/lumodudo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bb4c2c4b---buzetiwutenamu.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/v1u8lj4esoin2sau2fmjbii5jk/60314968221.pdf
    • https://aimtronu.org/userfiles/file/49306822745.pdf
    • http://jarosi.hu/files/file/menuvulozatef.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h7jopnecdoh19li21f6qao6mq4/jeworuwa.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fe78e245---50030007324.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/9767128add8d9def9031a218ad00c622/tilebejinijidivasa.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ddb3b522252fda47d6009ac7d270b05b/60421791128.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f037037ac---47749557596.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088408df2f28---25059340578.pdf
    • http://gerocuki.hu/user/file/45313369040.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dffba8a1a---33860954395.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mod+apk+car+racing+3d
    • 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_off0000db35.bin
8b734b7abfb1574c4f6d523299d0bbba87328f76e6f802d1e59dfd987a63ac43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5264 bytes
font_01_sfnt_off0000ed45.bin
dd45151d850fc908ba5ff62f7102fbe50e78512456bf237a1ccc6b22e16c7bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10180 bytes

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