Malicious PDF — malware analysis report

Static analysis result for SHA-256 5138fb59f761b5bc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 18:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e5cde02cf6acf7b492b93846150ed15 SHA-1: e922c21bf498d4486b54535f430ccff1459e351b SHA-256: 5138fb59f761b5bc9e3efce604ecbd73cf42c0ff16e29324c86334d3e3b6f30c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=odzyskiwanie+skasowanych+sms%C3%B3w+android PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c788fd47bc---totonerejevumubudekipupen.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c070a65b7---wogegujabuvap.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/536871154.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/16332615288.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e3932319---24240238330.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/vapizuxepuf.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/17932832565.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecaaa1273---jukekobupaxebevalodib.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614877be31e23---wokudabinamolokokopiwax.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/44688911655.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020027417333.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/79283169450.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/8988406004.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae4a5dd451---21665459304.pdfIn PDF document text
    • http://ossokahve.com/upload/file/77404435166.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/19311984344.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/magizago.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/sofapipupeseni.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210901_95480BC9939E0505.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/tonomikoxizevosudi.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/zexedunewipebotozuvotifa.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 18328 bytes
SHA-256: 003d32ae25ba226d0b3bd71bd908a69f2ed8736a32ef1bac0fc752832344fe41
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 11004 bytes
SHA-256: ca07901bc7de278698c77a3e0b3720648224d1b647bc5351ac48af3cfea58976
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1