Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c560c9638eb139…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 13:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0929a1331a64977bb63b89a9f3e0e0e8 SHA-1: 58bcdc44d5acb85ddc6f131861efd2ec23911e21 SHA-256: f5c560c9638eb139b54e589439bc740c9354ffe3add66c47528fde542be74bc7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adce95c97e5---xunif.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807429d6b52---5842367317.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bh8tcecde93en85vf2i9n26m21/menuzejanowo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/32295320710.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xuwov.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0f437df1---99124794478.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cd124c8f---foxavekurowowa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3b24be48756cf16058b032951a3b3c79/xirepejapafabijoneguvuni.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/56736652057.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/6949490816.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/44520247444.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030875b3a1e.pdfIn PDF document text
    • https://icbacademy.com/upload/files/37753684356.pdfIn PDF document text
    • http://108homed.com/userfiles/files/xofozaloravexezinap.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/66691181387.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/gerifajelarotegigunekusab.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/62417950757.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/30812736163.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/zopifetopowisemid.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f580e9d5a5---60530233408.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/soxifirijonenumipax.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/26280748079.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3f18e731---pelaxorinimo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9f9e344040e77d2d22bec1a6b465d1eb/91972158554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=public+infrastructure+asset+management+second+edition+pdf+downloadPDF 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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17028 bytes
SHA-256: f313f0d4a6a66b59da39c2e3f635d4d1745da8b0d64e5ca5723790836e14bb08
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 11288 bytes
SHA-256: 4a983abeae32ba83d226a27cd177ba9c405047c3c8d827bedd8e8f1e6c09b25f