Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ee7dc1d8d599aa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 09:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5f4817b559f553f6640c16a3f1e8fe3 SHA-1: bd439ecb8957524e9785722da98ba34af5d471c2 SHA-256: f6ee7dc1d8d599aaea6a56ed3d420ee3af4337a0734206bb7ddcb26f87a2cf97
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=cara+jadi+hacker+lewat+hp+android PDF link annotation
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/83817696150.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613604132d07f---mugadanuwuma.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613933f977d8b---47384868492.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tu69usnqu2jtvv8nffgjp6k4c2/kuzuvupi.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/rewiper.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/11779304240.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/egk0e9q3eukep0qmnctbet7acq/nonininanirutefotutore.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_968453704F9C251E.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/moposumabeforosogape.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/45058616753.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/98177322494.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/32300114600.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/fukamupebe.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/13376657617.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16274790617.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/35385011032.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/11724966155.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/fusoxabekebe.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/68266992977.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/58208826767.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/6544113616.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/76043930238.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 17088 bytes
SHA-256: 9ba502215d2a6ac454ff218fb19ddc228103a5c804cc728931ba2b042738a38e
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 10784 bytes
SHA-256: d4f45d2b648932ac83307b17ee21c43e6691c4f713d02da31e2534e6a5fff17e