Malicious PDF — malware analysis report

Static analysis result for SHA-256 6346a7b52ffe00d9…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 02:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 73332b489b195cf85acf13caa221d359 SHA-1: 6f76b243af486323f610417a4e4ad042ab6db94e SHA-256: 6346a7b52ffe00d9e888ad9b247cdc01c9d99371ce714634174acbfc2d5034de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=watch+godzilla+king+of+the+monsters+online+free+123 PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hd5b30n0q0ho41p4r74gnb81s5/mimekajolebowomen.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cvcavlt9h8t0gme2gqirrf97av/wijomitapesejeni.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/35qbed213avrsknbtacboth6oc/vovizidux.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5fad2536adaaf3802c8f074cc594cc9e/lolonazasipex.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4tkk09mp3hu0ngmkj697dlusb1/ruzidemadiwuke.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/muduv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713da6129a9---8006555157.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3be10c23692f0b955677b69e345eca8c/junuzokobexobugig.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/ginunabatajeruw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85dd468a51---29479284888.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8860565bed21cbaed9531982902cfd80/64085563000.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210628_180513_8024.pdfIn PDF document text
    • http://quaint-house.com/mopagifepajifesakawunufe.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/14081600792.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/11343839628.pdfIn PDF document text
    • http://babamoleskine.com/files/file/17125265914.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9975e794e744a3685fb26f038e5130d3/jitijokafewijo.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/41408736018.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d29bda61e---45639169751.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/7465642292.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a60b0f33---wamifegedodokavuzawekojob.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/mowapulosapawu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8jvgjv9dvh0hj4a784oej792ld/73141733416.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/lalopixixulo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o45puo3l6irkau396n80q049l5/48579023328.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ru5qrgqs10jcc6iniljpeeslv2/fadux.pdfIn PDF document text
    • 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11412 bytes
SHA-256: e869679dcf22e376fce6194408340cd18b7c35a18eaf772e04df9890a753a109
font_01_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 17912 bytes
SHA-256: c2c38f66efe07cd7b5afe7212e73c854763d54c77fcb21c3a15e9f7cc01d44f0
font_02_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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