Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1d81011a4955e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe2abe4e8ec7894e8f61b512487c7002 SHA-1: 081d5c910a74266e57322953bd4044319860bb29 SHA-256: 3cf1d81011a4955e983638f1eb07556e0e0dd9ce07b69c38cf0c4ecf910b3fbb
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting this attack pattern. No scripts were extracted, and the document body was unreadable, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=pvz+2+free+premium+plants+hack PDF link annotation
    • https://duproject.com/uploadEditor/files/bemagilag.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/26774925013.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pofalinujemag.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/56242019379.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/bodopibage.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/wakebugup.pdfIn PDF document text
    • http://farashimirooz.com/files/70218639456.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/89431865346.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/vigibebo.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/76458011024.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/93053530068.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/naxakoduguvekobor.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/62727883805.pdfIn PDF document text
    • https://banghenails.com/upload/file/lobefavizabujuf.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogekafaro.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_211127.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613390ac53e77---repiluzoje.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d7b8e09f---fewunujubepoxurubotul.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sozujepazafupux.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/23478279537.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318d213f3be---55563013781.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/mufar.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/wuzevawefa.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 11064 bytes
SHA-256: a996ddacc9604571cd65702ac5de56a328023d943d2f5b759f5a8f0823e7995b
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 17124 bytes
SHA-256: b46a1039c1ee98ffb840472ba46605038e49498c602e9bfbaa721e7f1294f20d

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