Malicious PDF — malware analysis report

Static analysis result for SHA-256 deec252fade7cfb9…

MALICIOUS

PDF

93.2 KB Created: 2021-08-14 12:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc4919b558566193b82af3790dadd2f1 SHA-1: 21182dcfd6a328741f44d13b5565472bed064381 SHA-256: deec252fade7cfb910c610efcefdf42af377305b87c07a5f68fec0db9f6b6b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://24emk.ru/ckfinder/userfiles/files/momekeduzisulo.pdf In PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/puxikudaxekavakirom.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/subugofu.pdfIn PDF document text
    • http://splogservice.ru/content/file/17657703521.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ckpm0g0fpgelreljp8s1c33bu4/vodulasasunedawugojisi.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210718_E462648D89E08E37.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4bdd4036ecaf2f3a411945ec7720b4a7/mopoti.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/lemaloginuj.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pelifinafozopevuwela.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/63757bc28e301793791832dfd0c4d727/pezisiw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcb6ed17c---kujefipufilodev.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zetizuve.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/vubiri.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/38878192955.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/safumaxu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/19765953246.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878385dadaf---15735533002.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d22fe1164c72e3572f2af9c140db0863/37000592589.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf3e147fa8---60037788662.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/22392883304.pdfIn PDF document text
    • http://ausafe.net/images/art/files/sanififeji.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e56d37b4c---8625926630.pdfIn PDF document text
    • https://fivetc.net/uploads/files/8768261415.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/vidimu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3fcfa5dfa396702e54f06c6ea204754/33313752450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rainbow+e+series+carpet+cleaner+instructionsPDF 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_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 17928 bytes
SHA-256: cd2ab17f926f8c2d209a210f4e74a5185f548a9f6be348f1c57606e006b6e994
font_01_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 10736 bytes
SHA-256: f322b25c1607b0e7c9658f3524e732f0ca30aa7f7616cf341ce15769ba1e778f
font_02_sfnt_off00014e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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