Malicious PDF — malware analysis report

Static analysis result for SHA-256 70245cd304d43666…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 00:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f0e7525fc69b9f54e256c5eabbd7dd3 SHA-1: 33181280383d1f4ef12714a8ae835246a2b9ceb7 SHA-256: 70245cd304d4366697b61aaa2abfb46521399d937cd2eaa9e93f5453f6a67e3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics and a high ML score contribute to the confidence in this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35b860cd---41137892501.pdf In PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sunedozekevadujafod.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9a6b5025394145f10a2d6db46015f2ea/xuziv.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/85679449992.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/5417885573.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/mukubened.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326863a28a5---wemajirigijivopabo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348ea4de9ea---94334582899.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/24922167337.pdfIn PDF document text
    • http://soles2walk.com/data/file/7896150211.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/78798210197.pdfIn PDF document text
    • https://guijek.com/userfiles/file/woras.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/67451254279.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/38832284491.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c13f17fed2---13090172745.pdfIn PDF document text
    • https://profm.hu/files/file/26567553614.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/43125896435.pdfIn PDF document text
    • http://esistore.de/userfiles/file/3340231926.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/josatuxegugimikovel.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613e64a90daea.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/9095587516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=latest+tamil+movies+online+free+streamingPDF link annotation
    • 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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16716 bytes
SHA-256: 63d56e265da80df75d9fec96bc435573987f78f3bfa546ec593b4c40106feb47
font_02_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10580 bytes
SHA-256: 1575e804b98512c18c7c663c67569fb10de80f39af74d904822301b58799cf27