Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f500fe2ba15dc6a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 89ec039271873e5acd82b43cad48802a SHA-1: 0b93dd8af2093238e9c4e3ea9cc10604e17348d0 SHA-256: 7f500fe2ba15dc6a60f291f93f5927db85608c2522034d8d92c59ba5c7666253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. Although no scripts were directly extracted, the structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/24043407a17e53743fd72f99434b1f62/famiwinukibogodademe.pdf In PDF document text
    • http://avvolodin.ru/upload/file/wogajososoviw.pdfIn PDF document text
    • http://metallpress.ru/files/fafox.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///61649837168.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc42c5f4a6---rizumotekegepuno.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/bomiregegoliduwudun.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/sigojibezogugi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5e4665a1---mulumukozir.pdfIn PDF document text
    • http://www.moyekolodin.com/files/javebesovuxe.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/famalisegezutesadomewali.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/rolaviweluxa.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/63417395319.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/95803992967.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/97658938745.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/14626970225.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/navodipaluzaz.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/66111265404.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/38478518826.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/29112439852.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b55829a0e383901e47d6820a754cda1/piberired.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/62dfja286vbcqdjb8kvguhblr5/82148052123.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/5333369406.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/55560306873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+san+andreas+never+die+cheatPDF 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10408 bytes
SHA-256: 5854ed92bca25486408220e80b73612017de00be84eb595d446fc617258a6379
font_02_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 18064 bytes
SHA-256: 63ce28e724f3d7fead8a2c5861644351a54fe665ca12982213bd34ae903ecdfa

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