Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1ab715b3b99bd2…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 09:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 409f145af32bc2b3535faf08a26b1789 SHA-1: 18d99a52d36997f17688131454c41f4372e0472b SHA-256: 8a1ab715b3b99bd23dce44b2539caa98d4236cc204c258a93e16ef1c342f45e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089970f7568f---gifaforekizez.pdf In PDF document text
    • http://ekstelekom.com/userfiles/file/65179158398.pdfIn PDF document text
    • https://melz-feu.ru/upload/12171617159.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9ac7165c---54487793754.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1627116540bewonebasukefobogew.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80775474146.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/77794436575.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/95318709830.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/snq5pgvopgn55rgb0h41050st3/loxinazuwebifofewipepeb.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/j1a91u97jjqfmfkpanaval5joc/47400786694.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/lorut.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nafavelilofovujukab.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/63608571644.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gtaheteq7pbmbfiq9lg1aspr55/xemurijojodubi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gemufinegarovo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/22ffd907bbb3fbb3f89987e5a4926d5b/37749066408.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kunubadotalurudi.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9982677ada4e1b66b9db9ef31961b77d/bokoligileko.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608138492e4a8---68165203705.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8710ce055ab63f6ee34e468e8c06aea4/45962111268.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c163b56c---66953157392.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/87367516292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+keys+from+yamaha+clavinovaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10952 bytes
SHA-256: 4770ce94b7dbb5ffe3636fcf6d7d3e000f0a1bd2e01ae0cf2959f5c0f7b3fafa
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16676 bytes
SHA-256: aa29bffd43da3200a3d19fa4efe96b51b026e108793cb9288b2c708d26c63657

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