Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a5b06550f441f4…

MALICIOUS

PDF

86.5 KB Created: 2021-08-21 13:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0ee8fe6901247286b962ad795c386aa SHA-1: 2e850c5e72ce9dabb28ccb289c845e760649964a SHA-256: 79a5b06550f441f4da180b0bb5a17115e4a8a49c145703592bcf557e00573bf9
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8dd21b8f---xabilekugoguzefapufiliwiv.pdf In PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/mivexiwatoboxojimesiv.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/47390791626.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/morilowedeli.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zuvotifenorog.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad0471642---pagomega.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/60272696170.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/wogitifufakusep.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/mikutapizabivajuxaruferi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c47254149---98650075183.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/rutunuzigirizo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/lonat.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/65059939117.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c6ff407d02192817e6cca8fb8e2fa4cd/95395921468.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cec096de---7038759330.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/11682757714.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/76311766861.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/milominotenekorisirekoja.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ccab5dcd1dbcf36ae54ae09bac814c0b/36554203319.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ac2a8305c422debd365444b6e060bc45/gogenamedinurezu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/13373050968.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/nujanazi.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/36000340865.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cb91360f---nepabijugegedepiz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa272a5fe---30670147476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+file+for+gba+free+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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10748 bytes
SHA-256: 9fe531666d0e1694b650b41e329cb880343c2beaa979d8121276a755e2bffd1c
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 17572 bytes
SHA-256: 2dcd135c727ac7397bc4cb1ca4f6cb1c873947e78722db92553b7b543b899fb2