Malicious PDF — malware analysis report

Static analysis result for SHA-256 c805931e1486548b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 04:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 132d7c61f685ba2d29161df53f505411 SHA-1: 182557f09c6fcaffcc2ab20996ec6a9fa28b29d3 SHA-256: c805931e1486548bfa9ce2bb73dd4fe17207513fe4aaeb92ccd04210254d28b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, likely to facilitate further downloads or phishing attempts. The presence of a 'download button' lure reinforces the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maketmaster.ru/admin/ckfinder/userfiles/files/reramexufukanubufefin.pdf In PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xijejarexaza.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613615856b821---99287891669.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/webeziresomupusizipesa.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/jirozapunapejanifati.pdfIn PDF document text
    • https://citronel.com/userfiles/files/43021676258.pdfIn PDF document text
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/somuwuwasid.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/1513533037.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/96105658213.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/visisamodugozixumokojixaj.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/faxokol.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jafokefu.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/nopazejatamizekit.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7c42615b---gekowixakofudesumusisanan.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/nizadujikur.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5gpu8bp2pm56adk49dkbkpdru1/26877548955.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/74121023784.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gubusetajaperotavine.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34464397198.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/gajusurujinipavu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/2763110082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+black+2+nds+rom+downloadPDF 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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 18252 bytes
SHA-256: 19a31e0bdf426145f017f86a6fae996535b59b452f1a279c78803d4dbd6fde20
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10780 bytes
SHA-256: 240733e2f41c2df69d7166ee6b9c3037ef4994cf04256ef6ef07d2f1111e3f60
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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