Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec8043959885e2e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 11:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d1c7899cfc4bfaf749d5cf6c4c42bf1 SHA-1: 0a2ccb72dde1834119d83bc165e183821e90a7c1 SHA-256: cec8043959885e2ea79c451df4bed580b2a884f491c17ccd3dca9a9dc7011268
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a phone number for a fabricated issue. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=completing+the+square+x+and+y PDF link annotation
    • https://tunhuaduytan.com/upload/userfiles/files/jafegenazedewiduw.pdfIn PDF document text
    • http://15881588.com/ckupload/files/59914073407.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/3152807019.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/zifefeveferaxokow.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/voduburol.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15800489754.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/fusonirivafoka.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/77684012100.pdfIn PDF document text
    • http://iucecb.com/files/file/gasunilosa.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/munasuri.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/74659030214.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/61958786183.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/7470747679.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384add93c1f---limegasi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/k9kikcbmo4as0bsbmfdo25p08e/sikapedajuw.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/roputovepemasog.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/muwizetubozowi.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/nonelidimuwonafatiju.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/25324491574.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/49794262fec6b015cbeb937f23daa861/93780571998.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xelixodulofodakuvav.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f84da3243---vuzirajebomesawasejejol.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/bipax.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/3572759742.pdfIn PDF document text
    • http://taigesw.com/upload/files/lukipuge.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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 15480 bytes
SHA-256: 92549ae7ebc0256cbd18bf94c9029080ae9665003215350cd0862459ef984e13
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11332 bytes
SHA-256: 378c59c8f76afbda0c38235d2126f08b600c8d98fb25fb745ed14aead3948ca1
font_02_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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