Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5fcc648d248e79…

MALICIOUS

PDF

69.4 KB Created: 2021-06-19 08:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a34beb72e9eb1a88d38bf7fbb3ea5281 SHA-1: 8e8b544de3100783ed3625acdc8f35e1b60dded9 SHA-256: 2d5fcc648d248e79eefd76f09134a5c8686efb7b1a6ac04c3e68bae9ce6bad89
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to downloading applications.

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 http://hubbardfamilycircle.com/clients/62940/File/18197305350.pdf
    • http://komputerzagrosze.pl/userfiles/file/12038333700.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5984ffccf96ed58991bbdda89493e2bd/kuvosoluwenebafadusudej.pdf
    • http://soudurelauziere.com/upload/editor/file/tezenuxexox.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af1316ac4---18131975666.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/61c4a2fcc7ee7277a2747ba8f2620d6b/55904492743.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/fonejigadivozoxumit.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/50568070588.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/632d70d0f40c417842688bfe444548fe/wajifewepupe.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072202f143a1---78281613424.pdf
    • https://aronabritcan.com/userfiles/file/23127887445.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6d553b7c---sileroxukup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=123+movies+app+download+for+pc
    • 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_off0000d0ca.bin
97ef93b100ff700c8ef1e52a19ea33a5088b2a84ff8e26c236372a6aadb4fbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 5704 bytes
font_01_sfnt_off0000e441.bin
0e850594b0f247a36f06f4f50070b0b3ad4c2a6c4db87d1a820689e1c1f5b6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 10816 bytes

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