Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3239d21f7b0be90…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 04:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79baa037fcc6df8f9233c15dd2de9e99 SHA-1: b1705ffae5085cbb8668d712c6e671bb5b8993ff SHA-256: e3239d21f7b0be90fcdff6c9327363a8b1e30b4f3716078e44fb24e3125b3585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=mi+a2+lite+android+10+problems PDF link annotation
    • http://jtylek.pl/Upload/file/benuwinujodomug.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/nolifodijovun.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/japebusifoniratevep.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b66089ba---9722896866.pdfIn PDF document text
    • http://dfanchem.com/upload/files/tatiburowukijalika.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa720280ca---jukufaponiwo.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/40844462393.pdfIn PDF document text
    • http://sbkf.org/files/files/3525965192.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/29011967306.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/kekufibafezo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/19840231137.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613172e966fc7---kilidapux.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/17903694968.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/junafotete.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/69975648027.pdfIn PDF document text
    • https://timminsrenovations.ca/file/x1eDITXrkkWlTxl2.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pavuwusudumitonadukumesu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d95cc7ff2---41977127374.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/miwowutefelur.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rofubisaxuba.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/49905537987.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/katavenifeme.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4f665e96---26808306651.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/57367117008.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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 16472 bytes
SHA-256: e81bed1641fb91e7e3f0ea6a09dd47d9b5dd8aeab2780fe3cc1da5d00ce51b84
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10980 bytes
SHA-256: 4afd1de311ec8331555e13e96477b82e28a9d2716386304167b9f2be377b7541
font_02_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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