Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8df65a9c926d189…

MALICIOUS

PDF

117.4 KB Created: 2021-06-26 04:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3096accd5c51154ea0c2ef08bb08667 SHA-1: a517da7eb21aa597b8fbe1e449d13641d7f61891 SHA-256: c8df65a9c926d18996cdefabdb2125f4c9d7f17de30c77a8f03e16cc8cc02ff6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely as part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://oniceh.ru/uplcv?utm_term=swtor+space+missions+guide PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d84dbfd14---kokozasexix.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/kutigidugunakapunipadise.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/dl9mo63obav6steriai4p460p3/wagibubanagiwodovasiri.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/resuzuxewozoj.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e71321b97ff1a0b303125b90ba1a6c54/gagawegujutogikaripoz.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/jaduxuxadotojuwari.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7508cbe117---23474920327.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/fumagomarav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caf55db78---moxarugaw.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44iog5vliplckmme9a3un90s0v/lodumofuzikakaz.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/nosejobozalow.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160928d241f398---livetakunexowoneridi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uk41sek9baebgev3ovqnl4579v/14072768233.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609270cb9860e---fiwobase.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/6805021526.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/kumujopunukas.pdfIn PDF document text
    • http://mid-europe-ex.com/5055544953.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/zanizugonis.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/namukupito.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jkdjrqmafojpc04g58qkonkl1a/tasaniwimari.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/pajusilijaxire.pdfIn PDF document text
    • http://maxbrio.kr/files/files/99289263091.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6cfe79d7511fb20e096506a6e77fbd55/xanusarazabawenimafe.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8da035d53b470db809163b1a9bc6bfa8/75781566791.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/29853946306.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_off000163eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EB 18400 bytes
SHA-256: b2a56cc1508daa6c9eb80d5d868d9629542d7a55c52fcc142faaad9b57776300
font_01_sfnt_off0001947f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1947F 11072 bytes
SHA-256: 5b1b8137f0fd8f7257846d0b8f68b0076cab1c68b93a4b932374971432073ea0
font_02_sfnt_off0001ae2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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