Malicious PDF — malware analysis report

Static analysis result for SHA-256 810e1b70ae463a3e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 22:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d53b682fe15d3ee8da0e7e056ae7111b SHA-1: 547e693a8c38fbfde1a5599a93791224e56a2ca1 SHA-256: 810e1b70ae463a3e7e5f9d63e71c59faec95e1d3ccc98ade8ceab7146182117a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress upload storage. The presence of numerous external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://beiks.info/public/file/dirusatoritusirinakif.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rvk5nj1uumdc1kcuemh2r7as07/93172627288.pdf
    • http://www.aluvascientific.com/UserFiles/file/regomurefazubalepa.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/43e84c9580caee9a231f313b6f35943e/83024965953.pdf
    • https://pbchistoryonline.org/uploads/file/28109758165.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/de7dec754e339b630e69792b37dadcfd/99417345489.pdf
    • http://vitaminyplus.eu/files/file/jowidadekulezaja.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79589176e1---98822772854.pdf
    • https://pet-fashion.ro/mm/file/pejunajutoronutimimu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986ae3b1c12---vovetukek.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8a5d0e7bc8e4b1587805c0fbb7ae5c9f/93855202556.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2952e979c---nosabatureguwinojekoxe.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3a6fc3eb488a6dc62a70881675027833/75388703240.pdf
    • http://hani-bee.com/userfiles/files/sewarawujaxekopililazi.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160874ab6bf87b---korakidijasomux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pennywise+2+full+movie
    • 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_off0000f83d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
font_01_sfnt_off0001104f.bin
8553f8217e960e6730fe45dd9f2969b8001fcc3345b44a9d5c837f0925c9ea0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 17556 bytes
font_02_sfnt_off00013e85.bin
6337193d52c919b592c7e85d64848724637fbd43cc7d5d57284b78e75c726ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E85 10504 bytes

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