Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b46289fea2684b…

MALICIOUS

PDF

131.3 KB Created: 2021-07-02 11:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a546ac733774e13f97c4953d71621d8b SHA-1: 5bb5fe244f4c72951415b5c95992411436163b3c SHA-256: 79b46289fea2684b35a5d8029212bd00bb2bc72d1155bfbeca879f05d14b4709
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of these links and the nature of the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe8314fa6---tudonejiz.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd08bc0363---juzenu.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81e3efa1---30873994206.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/64b9a603e63f38ad21867bc630c3b9a3/57865446088.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f133edffde---88970337614.pdf
    • http://nowyhotelik.pl/userfiles/file/53420324331.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/99054319514.pdf
    • http://qytbearing.com/upfile/file/73008170076.pdf
    • http://leebyunghun.org/new/upload/board/files/kebezobodeguwus.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7b56ffb2747687edbe36ea30e3db7713/49227161799.pdf
    • https://adasms.fr/userfiles/file/zulegevobezipedaxalujima.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607656fea46ff---nujavak.pdf
    • http://bindashnews.com/userfiles/file/sivimigavomel.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/gagozozexuduvugadu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/15563ace961e8542bb6724c753b50113/74062397040.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/69fcab43960e835e30a40809e90f5a97/nowobozibusifasapekakumi.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/bokojagigiloxonatibujem.pdf
    • http://comp-art.ru/userfiles/file/49346115820.pdf
    • https://radmangroup-ye.com/rgfiles/file/69418379376.pdf
    • https://planet-for-events.de/userfiles/file/91941417998.pdf
    • http://bogelaipigeon.com/upload/file/99267348282.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a300197e4c7---pekamibakolutaka.pdf
    • http://martom24.pl/martom/userfiles/file/79760414447.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+hypothetical+deductive+reasoning
    • 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_off00019aeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AEB 16792 bytes
font_01_sfnt_off0001b302.bin
dd03d30732c26afc5f91fe6cd7f93976ef187159000ab220891d98262b7ee7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B302 11432 bytes
font_02_sfnt_off0001cda7.bin
47c949477550de570ac070c3142db81debb3d01632f742320da6c5a375d29213
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA7 18496 bytes