Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f7b49257644d50…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 22:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 932d6061b5eff01ede214ef2cdf5488e SHA-1: c1db0efb127411bf66872640f2edc26f21e95268 SHA-256: b1f7b49257644d508ae3686e7d1f20e08fd71d88e0e19ac29c4f366058395493
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism to phishing or malware hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to leverage search engine optimization and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=password+keeper+iphone PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bdc345bf758cc1ae06e9e1fe947bfbe3/vebazupopegaxexaluzut.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/nesavolikaxisom.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06f0b3f9c---wifofewoxugipo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/6780498311.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33556617419.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/57703609126.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/74017446600.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sawiji.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/nirazetowedupokosemu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/1930421502.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631933949.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/jopiribijisevu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904012138.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2f5pcbcs02od1ncp2b3mblkb65/mebusoxidisidotizufik.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/28089181249.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bakifilememu.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/kijisidov.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tekajugemakijubufuboxuxor.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rexonovaraletukof.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0775d2a93b2953b73defb930ed9fbfcb/56378542691.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/98571633922.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/lasurilinujolop.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73636703969.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 20540 bytes
SHA-256: 901b017fb44a691aa7e91f003728e80b1f345b4917c3b9b8f3b74bdeaecdac09
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 10524 bytes
SHA-256: dc1a50217fec2de33bbbf3dff7b34ee627ee4569e5c1be22e9ecdad32bd8f5d3
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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