Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f695e712b14a7c5…

MALICIOUS

PDF

90.4 KB Created: 2021-07-06 04:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b1c67f515c693166913d0be056194cc SHA-1: f7d5c088dcac472f1bb6b47ad99c033b25aef0d1 SHA-256: 8f695e712b14a7c5b10457d9c4dc0ecc94dde6330735a3054d3da47a4a6daa1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign aimed at driving traffic to potentially malicious destinations. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=fifty+shades+of+gray+watch+online PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721e3aa2698---gaverakesasumamaxugegot.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/89374677589.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291236eee9---80567953607.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/zuliwurewepanuxomanokanuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a7882c2d---24266203187.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/81506360471.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f256bdd17---vubetomepatiludidabado.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccfdd79f2---87479699568.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607155944e322---51057995824.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/16655696325.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/rubumupavisemojex.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/56681823422.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebcc29801---xobume.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8869893cfc---setomasipiv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00dee83d4---wosopivalujajovixewuz.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/70eff4b3d61ec28b7e8277d473453422/84929539544.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607064210a43e---sukajunopubowusu.pdfIn PDF document text
    • http://livestocktool.com/d/files/tibepegimajarakom.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36468967583.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/supokisamowibotijawabo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/79288207768.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfe3a8a6c---20710341312.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1c20lt66u0bj5a452fq3hdvnd1/63328203381.pdfIn PDF document text
    • http://lapiadinafelice.it/file/39032394256.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/buzakodugakogu.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_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10932 bytes
SHA-256: 67d57f94cc8a1ef9d529d282fcfbd1e5e5c222bba9def48176fa07f97e6198c1
font_01_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 17884 bytes
SHA-256: abdea17b63b2040d4262669a70806caa0650c6c890326767082bf9428ae7a4e6
font_02_sfnt_off000143e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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