Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11500216d6c6dce…

MALICIOUS

PDF

83.5 KB Created: 2021-07-23 11:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b77f922bde1f34d2690be7f8ea04606 SHA-1: 8cd400c82dd673eb2648507490a5e2185caa779f SHA-256: d11500216d6c6dce3f5717f78e6b4012b1c76746995d6fe9de460fdf233df196
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to compromised websites, including WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/74aadd24fabf1590e1a778d27af66478/taxisiguxago.pdf
    • http://kapli74.ru/upload_picture/69320228624.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/88396711366d721c047ec256c1e81e2a/momodaxine.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a46c4c14cc9b77565b7efa91ab3df75f/73922372063.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f551c0652c---nexafa.pdf
    • http://hungthanhauto.com/luutru/files/xeragedonulobewawe.pdf
    • https://tavio.ru/files/file/18488927862.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8d1ca0da---nomefibunafobi.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1d354e9f6967a0f63131cc631e2a023c/soriwesutefojitileta.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608378492bfee---310182832.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cmqeomq93itcv8o39rb8q8rj6u/82639642346.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9bf0f75817ea60718a4261b2eaafeac3/vemexowitokokex.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/93cf53c8a575a679fc81c7d98bb992ed/91207998104.pdf
    • http://extracam.es/app/webroot/arxius/file/35802429706.pdf
    • https://abofahed.com/userfiles/file/94664905857.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/34qon5ul81nhffvil054ie9ni2/91356305596.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20088b75e---monewidufepabirofopolekir.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac31abbbb---wozoxow.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/21785465967.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbed1f02d4---pekisalijurezudaz.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2447c5ad---26266754541.pdf
    • https://lescourailleurs.com/upload/editor/file/fulukogisev.pdf
    • http://techcessgroups.com/userfiles/file/vusodukogurijerimimasiv.pdf
    • http://lycee-elm.org/userfiles/file/xakelewazavekokegiki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=credit+sales+in+income+statement
    • 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_off0000e656.bin
bbf5ba2554d9cd41dc2815b467e2a853f0529447e575e7a1564ce3aeefea80b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16280 bytes
font_01_sfnt_off00011090.bin
4e4f41ec53c959dc1638ac53aa51a6296846161d0036afbf8ff19e82f8a493f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10560 bytes
font_02_sfnt_off0001289c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 16792 bytes

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