Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbf7130e21bbbe6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 09:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3bc5578f02977ddecf77eac83d1eedf SHA-1: 6eaba74f5ecd7a508fbdfd510ff4047e48865765 SHA-256: 8fbf7130e21bbbe6433eff1e849f1e07dee3069a65d7fb759135c010fd67d1b8
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering tactics, specifically a browser extension or update installation lure, to deceive the user. This heuristic, combined with numerous external URLs pointing to potentially compromised or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file, indicating it likely serves as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=current+affairs+pdf+download+bangla PDF link annotation
    • http://geombiagioschettino.eu/userfiles/files/56035945011.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/gepemezodidaxa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/331bb2f9f096fac78f349a34f28ef2db/59957736220.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/25634666382.pdfIn PDF document text
    • http://axwelindia.com/uploads/17761500603.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbbb77a3b---38003023193.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53dbe64774---pimodupotokafewutudosowu.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627228972.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vajuxefil.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108100003076195.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b2bed83b---xasuxonewowisevozutimu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5569efd33---bobezufuzozowoguluxagik.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vqljk4iotqbf3o6eke9c4oejpe/fuzexamaj.pdfIn PDF document text
    • http://short-story.ru/upload/file/waremaxilazixomonus.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29fa1ed7ef---kuponifafi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mapebejadadiloguzuram.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2bf027ef---53701992082.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0eig1mhgmurhrjab910mtfiu61/getaforova.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/85727228962.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ttnja8c14lngu9vn2180r29q65/bepudujidex.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bomaragekubotudedelid.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/pokufolagesivemekok.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/tikimumutonasikijubatobu.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_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 11028 bytes
SHA-256: f7a475525e337bf4b698fb2ba05f559d2bdebb552b4476b0a34970e57afc8a7b
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 19620 bytes
SHA-256: 53bf0acb360363086607679641ad3e5e6fda68edfa473d2f56ca745e9d7fb727

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