Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0cc22e701ce078…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 21:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbd7e318eec6b82a17590ab8ca791368 SHA-1: cdc9d05fa231f71200c9ca31a922270cfc502dc4 SHA-256: 8f0cc22e701ce0787fb4d798209b47c14944565a9502aaf22e73ef81b6818c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bushregenerators.biz/userfiles/files/40193965507.pdf In PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/kozodugigudexanuzapekif.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/popazabatovujunasotokif.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/munajukapevagozananubil.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/dikuro.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/bomexisisudapoku.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/4413445491.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/16188838181.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/faworudixop.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/gonipal.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/memagalifiguxozolesemi.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/xobezewokatamelinibezovok.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/98863638622.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/18345667713.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/vijixolemejisaz.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vilasakawomudepilam.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/48679253874.pdfIn PDF document text
    • https://jjpremiers.com/files/gadibegubagoxexinepupibod.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ecd7018c---tasepamejifematomofewuw.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2c8820432e66273c9c6e7a98161f9488/86809349877.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97421112747.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/keluxifagoziziju.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/37961074318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+voice+memosPDF 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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 14996 bytes
SHA-256: 91b6d2e811ca1a6b2c30a6fe0722d3e5316769bed6ef75949ea6ce6ae72bfce3
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10272 bytes
SHA-256: 586e60f4d70995f23c5d18d7244ba354a2b518361331259ce566d6d83932d8a4
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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