Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be1e954bca6082a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 02:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82439bd014354d8b6502cbb9f6b90f38 SHA-1: c1d658dbaad2cbfc7e66bd46f60b7498f9fba00e SHA-256: 3be1e954bca6082a31883d8067a60f3953c90b1a7404b951bcd6d1c32aee2ab4
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=the+help+torrent PDF link annotation
    • http://nhasachnguyenvancu.com/Images_upload/files/94883477792.pdfIn PDF document text
    • https://edusfera.pl/upload/file/logapaterogufesibuzufike.pdfIn PDF document text
    • http://shesob.com/file/files/miboranazek.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/45543032316.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/7441166615.pdfIn PDF document text
    • http://teakdeck.pl/files/file/77722265339.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofawakafetetof.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/774546875.pdfIn PDF document text
    • http://e-hematologica.com/users/file/51911194391.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e9uk29iu5tf1thb4bqkomna3j7/figezamov.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfd2c0940---53782881352.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/21498483491.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/28071350039.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bufusegoxetofegikerum.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e3a32bbc2c5b984cc1ac219af98a61c7/nekomejonuloxigigozev.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/wodutob.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da56fe67---3066539504.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/65575373338.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/gukow.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/tolilupiwugikom.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/72498722.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109100702314495.pdfIn PDF document text
    • http://minerva-collection.net/files/files/kowapamid.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_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 9888 bytes
SHA-256: 22c434c4cbde6b54c3c1b6ac817a8be7c12d214f553d37662fa43aa8f3458c6e
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 19376 bytes
SHA-256: 4a5e4faf8b1b9d9befbcc66be3622a785eda8846c2a2a75e53d549cdbbdacc42

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