Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25ee40fb2a6b058…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bf10883e4eacd7dd89f4d738a5f3f95 SHA-1: bf08aba7dca6999e11e14bc3a97dfbefececa522 SHA-256: d25ee40fb2a6b058ece03e66c8762152996bb33886f6d6be7139c9ffcf59749e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number, likely for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=bridgecrest+auto+loans+phone+number PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4sj54ulvbo31v2e9878mgh7tt4/zizewow.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/92607944683.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7d51cec0785727d727fd374fe8312ee3/kunozapubafamasovekexi.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/potoxavova.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/59689902597.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7dad5f0a4e---27308878990.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/govobe.pdfIn PDF document text
    • http://hybsch.it/upload/file/31513984617.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v4iltesee8bsm5nimk3i9j6ev2/nenovudaxadobesunixi.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/belazujugefe.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/23907975402.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/62207257099.pdfIn PDF document text
    • http://adveotec.com/img/file/vinivon.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/329055261.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rimujaxinewunezikijuriga.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e83oj9c96qi15b5ao1kabafjq3/bagofidepumenabusurux.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/87932906156.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/nilowufovivoxojuvi.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/gerududitejuzor.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f2c13e57---xeremira.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621220739.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/81395410183.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/25755279387.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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16680 bytes
SHA-256: 7fa9ce02c1a52370c2e75419d675c2ffb0912452093f5b4985e9b5c6cb3040a9
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 11256 bytes
SHA-256: 8d1a47949e5cc590c5e4065fd7da718a5caf95fe7fdd8500e26a16f05ab79317

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