Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6417b7850dd4d3c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 18:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d751f749eafdf8f8b649606bcb8b3771 SHA-1: 8b3b13f044d67dfc39aaa2cd04860b22896b6ce8 SHA-256: b6417b7850dd4d3c2e064ce239150d93cce25030496c997a1473c7d914ec2a67
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but rather serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://centromedicoveterinarioadda.com/userfiles/files/78896330649.pdf In PDF document text
    • https://trisyscom.com/userfiles/file/ximulixanezarip.pdfIn PDF document text
    • http://p-energo.ru/content/file/46807972933.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/25221844657.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/wasibudabavizipuwajofefus.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/1878551136.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/6344654430.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/56288684819.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kowewolonarexu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/96732645103.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/tifarijeriku.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/safazejalufe.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/48101772174.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/74582879799.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesakixogetebejosun.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/japezovobi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kodixigepawanebada.pdfIn PDF document text
    • https://huanghecables.com/d/files/beligunobedezazegumeralu.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/62145549221.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xujidixoburexiruk.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jozanijonetonigezud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lp8sddkdj5ij5pnljuqvt14rr2/46175234938.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wiwozefuremi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140b7e192---49323558868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+process+media+parou+de+funcionarPDF 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_off0000bb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB93 16516 bytes
SHA-256: 780067d8a8be570914a82ec9114ad843bd5aaa8f8e89208ebe6371a06ea6622e
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10720 bytes
SHA-256: 0a7de62c1a4f146b74c43586601a899d22bcb0d97a73ad972d9c80cf81da92cf