Malicious PDF — malware analysis report

Static analysis result for SHA-256 03859b0b2e2c652a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 10:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b697073776c40554a9ebf96a22b3b77 SHA-1: 6638c90bd41650796c1fa240be845d0ba1a391df SHA-256: 03859b0b2e2c652adcd86229ce81c3e4983b305e57240d34b086ce04b1546fbe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The document body was unreadable, but the presence of numerous external URIs and link farm indicators strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=advanced+c%2B%2B+tutorial+pdf+download PDF link annotation
    • http://ankurgroups.com/userfiles/file/watofawolej.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef35071d3c---55054275461.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ca97282cb4b7b953421a5943335802c4/29507309674.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c308e048731---55818065768.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/dotod.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/tesixodopibapo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/91fd29d2b6f7daac9fb3051d37083e42/29367864370.pdfIn PDF document text
    • https://efnnma.org/files/file/69743912757.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/18234413796.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c2ec2d9253---21497535477.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/24f2c6489f00d3478f86a09226fcc6bd/dazaluwizabega.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/28037251071.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/nkipc9cd98bev43925h65p0hr6/juworegoturimedekis.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/13444176132.pdfIn PDF document text
    • http://swhos.com/upload/files/74788020112.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/relanilozodubikitanuge.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/bikosalodudebi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe9f244aa---60219659464.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d767eead6---8832939430.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8364f1cc71---jokonutugabowofisasan.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68155037985.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/lasetezefurewutepafeguniv.pdfIn PDF document text
    • https://bem-sa.com/img/file/96943608226.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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10680 bytes
SHA-256: 066e23cb3817ef925f3fd802a898e3f75b7840f7439c9f280a2bb57f756a7f51
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17272 bytes
SHA-256: 79b6ad6ef457bde7deaa999231ed4b049252ce935f04fce20d02cdff1ab5785c
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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