Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a1acf53b3edde…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 999230b94dd2c25574896a39bd000939 SHA-1: 30c70ff976a4a50fefcbaf5c6c9b46d1bc6f69ea SHA-256: 081a1acf53b3edde236fb3bf0a229492454b7771bb9ebece46fb6f8573edd21c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites and disposable domains, characteristic of a link farm used for phishing or malware distribution. The PDF structure and the presence of link farms suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=thematic+analysis+diagram PDF link annotation
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/71ad7f51e952c4bfe09672595864239e/luzifebe.pdfIn PDF document text
    • https://digireg.es/upload/39678309384.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/97714075435.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6857ebe6---ximasobozamuzategi.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pebekogolusexamosujodevaw.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/juduliguzavuju.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sujofufitufogeriku.pdfIn PDF document text
    • http://reichspfarrer.sk/file/soxerexekukenej.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/44954442524.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/jarike.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/keluzutug.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/p3mi95jifqr5nst89g7ast9e0o/30788637405.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/91280435474.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qrbfru2haacto009ccbgegve20/91649791116.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/88007217828.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/6pfeu5mkgo1o9r24utk9e5jm7q/86887050749.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/risibitedukerubar.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zofogamel.pdfIn PDF document text
    • https://synersys.fr/contenu/file/jogemeguz.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tatodugujesa.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/81113530710.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/76673167740.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/51598121616.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/73477195863.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/45524450863.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_off0000b6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D7 16804 bytes
SHA-256: b9e1fd42eeb0d613b270bc0b76bc72ef3e3923bfc1bd578104a6997124a03e18
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10772 bytes
SHA-256: 739cd304881778e85ad1da991ef0b80f30bded6d21b62246de57a6dd77bc3572