Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc90740c9982082…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 00:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5d0b6690272a0c49e8f6f2037f3d61f SHA-1: 3b0d50a3aa4e051dfef06bb801081205f31866cd SHA-256: 3bc90740c9982082a4f23af2c890440d0609be4ace1199f446a0577a86646a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=pathophysiology+book+for+nursing+students+pdf PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/aa1471f99ff41edd26c88f1aed00edea/rerefibatofawamolepibat.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/dojezetegogevopogu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/maxolulif.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tipukigenefexivoripa.pdfIn PDF document text
    • http://lejuriste.ru/files/file/dofujupufebinewagak.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/81764180447.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pafekexaroboperirekawaxi.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/81770370653.pdfIn PDF document text
    • https://ancoraeducacion.com/images/983529888.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/93831580185.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2eb984f6e3969bf15987aabe1eabab06/fiwexez.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eae26a6b1---fumolaw.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/22427634054.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/napeximodokubosideba.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/bawuxaxelimo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6415851a8---12559072394.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bixikenumanubago.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/9750324316.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/93126982242.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/gewogo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fu345bo1a8lh80n8gtt54obhps/29280265077.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a79740b7633---gutivexoxamepumirex.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84810847541.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84eaac0a78---wiritirubuxaxunebenimi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 11224 bytes
SHA-256: 320dd9caae8dfb9bb6d10a7b4d1a18853121ee3f37775e75d431db4f03c8a3ef
font_02_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17748 bytes
SHA-256: 5ea0f64eb8c721f923fc80819c2583d1ceeb426059364f9eefc2a83803e4f645

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