Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ab82fa86d9000e…

MALICIOUS

PDF

61.7 KB Created: 2021-06-20 12:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ea468d63a4f848baf6f1e44df5a477 SHA-1: 390b81feb6075c5ebf1fed83d1acd849780d20ae SHA-256: 01ab82fa86d9000e9bac338910ee5eaa4f80e05ea78f3adb513cba71146bb810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document's content, combined with the heuristic findings, suggests a phishing or malware distribution attempt disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc73d68c---78880252160.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b69bd6d9dfc258d8e7924b1094126e76/vevenonuvodowegevu.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/55846138250.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/669b6595f4863b70cf4633e77a2ad39b/41970351047.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb60453c4---97641517728.pdf
    • http://haphadoor.com/upload/files/sawozileludu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae82df4d0---wuwofopefidamilejog.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814d83d3155---baloxu.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c927d5b8c24---megadinadixetixafaloz.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/072bc31932f596a7d0ddf6b533f934bd/figuga.pdf
    • https://kartplast.com/resimler/files/80941344968.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608997549df06---foturegilow.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2caee19056d70ed2b8fce8e2dea4726b/kosodenufizalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ave+maria+song+download+mp3
    • 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_off0000af48.bin
5d13a9435168354fdf84889a40e0d8876becce2fe14687f33c3f12e2470b527d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 5584 bytes
font_01_sfnt_off0000c243.bin
093cd31afb62f058dce586ecc32ac4d7cf60690612775288a791119326e845b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 12404 bytes

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