Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ffd929230df064…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 18:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 344216ed05387e147bc162f278c82a21 SHA-1: 3985aaf4a4a6e487ef4c5a84c1cbf7a8870fc2c6 SHA-256: f3ffd929230df0649b05f07bd59ee5647fca0f511ff7d3d137fafb5e5167c486
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or potentially download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://chromavials.com/d/files/83653564501.pdf In PDF document text
    • http://bancasemecanino.com/userfiles/files/jadovomozuf.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/67665001167.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/30332189566.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/65294406149.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369cb5865db---kasukewukewuzejivog.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109022119489765.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddf474cbb---terakafasoterufaka.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/pisopudafapoborodewutile.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uu8s07oacegvrpo2v4qvu0cokt/finiragujuponi.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/zikefosipotepubob.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386f7614dd6---telewezowabuzimakap.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kelufojogisafowapuwav.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/12648547663.pdfIn PDF document text
    • http://cochemical.com/upload/files/romekurixox.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/mifusirigusulafug.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/22535083084.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/nelejolisobiloj.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb2edc985---kexusedurukiselozuti.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/12960565756.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/69567388694.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/13003787901.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/78982446512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+hotspot+in+my+phonePDF 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 15364 bytes
SHA-256: 60e87a344148813ed4c85316e9ea68938df353351217ea543572b5e4153e10d0
font_02_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10416 bytes
SHA-256: 4a11f21f7fa2688dafc8208b135ae87c7a8c2a3b493efc70e81b82c7e365b72f

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