Malicious PDF — malware analysis report

Static analysis result for SHA-256 51740c5a0f416a0e…

MALICIOUS

PDF

85.9 KB Created: 2021-10-07 13:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d92ca9a2bdee09ed2b9f8d10866e28b5 SHA-1: 56e7f13481eb3d743daa09c8d53f59fb4827a6ea SHA-256: 51740c5a0f416a0ea8637e910822dba9813540ff5715f7f178bb8fd257638b60
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature. The document's structure suggests it's designed to host a collection of links, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=an+exterior+angle+of+a+triangle+is+180+degrees PDF link annotation
    • http://dorapeyzaj.com/userfiles/file/67776819603.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614beb0023323---gexamid.pdfIn PDF document text
    • http://chayka-svg.ru/files/teminibosal.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/wazukuwudewoj.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/fuwavun.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/wirero.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c4ef044f---24076840503.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/35838360471.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20211003124322.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/75278166366.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/madatuza.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20211006075629782.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/wojumupiserekurol.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/difagupovakojosefupavikug.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/26749510292.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132aec2b0ccb---sopidutefezarulujedawulil.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/talodatuwenijonaradebif.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/gobitesivazeweri.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/25867330412.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16154180307299---nudaxoxivaxetexilet.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/37870466832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580d647f20d---82338799262.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/tozagesefugi.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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 10992 bytes
SHA-256: 3f0793527c2e4f33839f40897bfe659067d88c87c5f225d35d78776bff54e4a4
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 20116 bytes
SHA-256: bfe5adc8823e024d001b87b9a7593f60769177adc6c774655466b6fa5badf418
font_02_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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