Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adbfb7f24c74da6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 15:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e41f23b630a0d9164ed2d5a2edd91a8 SHA-1: 8bce9379a0d596b3a92aeae85371db19c32bd821 SHA-256: 5adbfb7f24c74da6571155c7a64b01c68703f1fa984d3c804745f4d6e50d3304
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or identified as disposable hosting, suggesting a link farm or SEO spamming operation. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, but the structure and URL analysis indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cada9f1c6---zilokefukagebilare.pdf In PDF document text
    • http://parkhighclassof60.com/clients/871169/File/43488908062.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12c09b26c1---vexovasoxiwifajajedifor.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/tofudakidakeruxarudake.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tomitepimatabozanadumemu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/7832197894.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuziwolewogolof.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210627060314-16371013613.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/najoxubegonivawuxulajer.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57e11f732---55375361721.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/xomopawafe.pdfIn PDF document text
    • https://nada70.org/userfiles/file/nadupaxovutinilem.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/42621986385.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7ed3deva3rjutjn4kbf5t88so7/50208602819.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/9324988357.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160877273c80bc---wupebijutuzudenoki.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/luxuxalatij.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a6d421ekdbai7fko0aqt3553rb/kirevutumi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/953e8488f34188337f89d0b30daf7dac/41201036733.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/29f07045059ba76ff83a63d750fcfbc0/tuxuxekifoladalanikew.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3fb7d3485ab780fe79dba5eba209e0fa/noxamuxuselovufura.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19313e5c53---72658786302.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/33376219081.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexopogogevavave.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa01125834b---wiwojoteberam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=appreciation+letter+format+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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 17156 bytes
SHA-256: 7d5fb46dbfef77b6d3cc3a9d3ddf37167f1e372b47c38741ab4c6b17c96b1c25
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10596 bytes
SHA-256: 32ca176189fdf5f8e6e15d0d36eccf778b56d3913a59a0d5c1fefc532d2677cf

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