Malicious PDF — malware analysis report

Static analysis result for SHA-256 629ea5d0a0bdc0dd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 09:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 323172f10c5a33ded5003b6f9055e246 SHA-1: 1e5a59b2de81f7b89cbf652d94aa9d9fd854932a SHA-256: 629ea5d0a0bdc0ddd090b22422cd870b7e025c508749c481ac291d1dd3fd2f0e
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external sites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. A critical heuristic indicates the document instructs the user to disable security software, a common tactic to bypass defenses before delivering a payload. While no scripts were explicitly extracted, the overall structure and heuristics suggest an attempt to lure the user into a vulnerable state for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://drafthe.ru/uplcv?utm_term=windows+10+and+ubuntu+20.04+dual+boot PDF link annotation
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/61587061357.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/81673566030.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/20133154763.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/xavir.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/44748826668.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133121687a7e---75424931304.pdfIn PDF document text
    • http://tulga.ru/editor/files/87243807804.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/86666758922.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/53678425072.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pilavemaliworaxoditasekox.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e01cdb7ed---23912450477.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/mifot.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nefozobebupewiteros.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902022641.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c35e8a4f---39341088485.pdfIn PDF document text
    • https://seger.cz/userfiles/file/17417593091.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5e8b8cea---lugisorapilitugekagomejo.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/fovasabijeruvabozozebogod.pdfIn PDF document text
    • https://yasacompany.com/upload/files/rubivewukawolagibuli.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/48106987274.pdfIn PDF document text
    • http://jsdarvin.com/files/donivik.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b707e1ca---58800077324.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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10764 bytes
SHA-256: 682998b5eaba176195fb15295b2da7718d7f716abb57a3a057d75d8e849b27e7
font_02_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 17464 bytes
SHA-256: 496d9528a190e639553cc9522c31628e44678f511112e7b29bdef537c377ef56

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