Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb4a979b24aaa2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 12:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61ddd265355cb42958b06d950111f92a SHA-1: 9116c33243b381f0b00e53d086429706e7da2a98 SHA-256: d9cb4a979b24aaa24879112d69fb5e96acc4c24ef3ee7f4c802ac99c57efb9d8
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 websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. The presence of external URIs and link farms points towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=how+to+enable+caller+id+on+android PDF link annotation
    • https://ijmscr.com/ckfinder/userfiles/files/waxexalofajuzenizefoviba.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zumepaxejifizagixokixobo.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pelinut.pdfIn PDF document text
    • http://chemicalengineers.ie/images/92592561053.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/vedazozakadaro.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/32382148780.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/93093198728.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xewoliroveliduditaj.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/nagefefutuzatig.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066fd9ec37---zunikewogeto.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/fabejoxug.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/73422806459.pdfIn PDF document text
    • https://rosycaffe.com/file/16311603297.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/31983758844.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kamibiga.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/reriluvatalalemado.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/79519209205.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/29755603010.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/4266098937.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/bararuzezisatize.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/redifezezojetagof.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pejej.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b9555a518a223466d00c386f7e967490/wozabamamalaput.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd196c9ec---sapul.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93556200184.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8afd661fb498f8b712334f4592a7ddcc/nepegesofegojukijasajew.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 18464 bytes
SHA-256: b602502b85425e81ece7342887d89f384971c97d947190c22a042b17b1904f99
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 10412 bytes
SHA-256: ee5ca9b70d726f0b8444909645c5e9b6f5da2ea5e585c3191fb2a488347114d2

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