Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb8662cb7d04cc3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 00:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8ef9ae96c9a22e30cf74fc4058afb6e SHA-1: d65f8895a91a02880e4983b4c0c091e55d0e6701 SHA-256: afb8662cb7d04cc3a9e7fb63e5b5440671e5c7c4c9e518e02b91be93ae47298d
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into downloading a malicious payload, likely disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://airshow-bg.com/file/9552317245.pdf In PDF document text
    • http://robalton.es/Albums/images/file///janojopimafubabexosa.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/mamusizedewemetewifigiz.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/89519955605.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/kujeborazumopuzalezijew.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad329d0b8---53942183784.pdfIn PDF document text
    • http://ymmicro.com/files/files/34518594086.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/58720958523.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/98610313761.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eef881ffb---xaxalibafiwenupitofapas.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071993b08913---mavipam.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fujaboxejovukaz.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kunorokogozo.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/26634642427.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/02a4c079cf78a9a068ea80e8a1368e51/93541343807.pdfIn PDF document text
    • https://deepex.hu/hirek/files/9728031578.pdfIn PDF document text
    • http://precisao.org/files/files/63303476556.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/badugufarenuvenemem.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/71014362347.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/10773191873.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nozolutoluvorok.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/sotudaluropabaxudetaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sketchup+make+tutorial+pdfPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10880 bytes
SHA-256: a594e20bb6b6573f6f033a2277a29e6e16b35193670a25af99e3a136201f4e6a
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 17812 bytes
SHA-256: 71ccb39080feb0ca81ad368a7299f28c8b86990e0a13fe44b3ac35252ff3e533
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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