Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cdc4763dd5ab16…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 05:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37fc907ebc61a7538de288693494c3b7 SHA-1: e6a4c69d8731bf43c02f952232265574349849fe SHA-256: 46cdc4763dd5ab164552070e8a165c73d3aa86dad5e23865cda032500edbe65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. The presence of external URIs and link farms suggests the PDF is intended to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=sonatina+in+g+major+beethoven+pdf PDF link annotation
    • http://synthecinter.com/userfiles/files/didudutiroxemelukixire.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/4534482205.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/96556886315.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/fegobobeduvelugid.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/tidagalujujamudupad.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/fobuwarokofofojozonenupuf.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/barojagekewa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850abddbbdb---55490269977.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f7ac903c7ff0c7f865967dae887e812/dubijowumoxomukiz.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/67629000232.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d92a5842---99376264886.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/pisufazomugipugunikifime.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/24589962349.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-6/20210806183447304619.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/rixafiwisuvewusite.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/likolupinon.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96c4b65f9---lukowemowubal.pdfIn PDF document text
    • https://webhosting4.net/media/file/gomegalifikefexebara.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5620cd4ba---5443269183.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/23988441795.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/16858343525.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a072ebdc---jovida.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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 11140 bytes
SHA-256: be35658c9ce73357170742cf19cdab84c0b162ae66dd9b6becfd6701f1f73cdd
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 19744 bytes
SHA-256: 5820884988a413baa7fd21730506f11653fd009ae7a1e43d91a2e842b4674981
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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