Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edc002bd91dcc55…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 22:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96a43ee7f9bd459c33a8d9700f1b144c SHA-1: 0c10c8f96b9027955084ae2092cef78bd7a6178b SHA-256: 3edc002bd91dcc55d1120aa8bcafd1493b175efa9323531dbeb43d4c0103e81a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=how+to+increase+volume+in+redmi+note+9+pro+max PDF link annotation
    • http://bowlingkillers.com/imgdb/files/zebegijawiniz.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/35797662858.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/505ddba299125253a6887ec65df10e0e/74299540797.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16142560f09767---bujabaxanaxujerujerura.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34553316744.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/zijaxuturenudodowosorudo.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/50397161781.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pufilorudatu.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tegogid.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zozis.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/37640200858.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/sirod.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3b58d09abef3229d176bb55b9b292eb4/fiwurevanobimaburu.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/14046071.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jakegomutebetusiwalolinap.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/49013844224.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/nuzetunawikatirawome.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95948547825.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/80172667895.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/20161094481.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/44183627028.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-07/images/files/vovowesiwavamafekod.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_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 19620 bytes
SHA-256: da083f3b358ca481b04b3dc7670da92188656cf4920f81e9722367ac92d3787e
font_02_sfnt_off00014ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE1 11188 bytes
SHA-256: 622696a18a337c6b1170bfd5658fe8f023f672fd5ca02d7fcc47ee3d3f252837

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