Malicious PDF — malware analysis report

Static analysis result for SHA-256 5687eb8cc502b2dc…

MALICIOUS

PDF

170.9 KB Created: 2021-06-28 08:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b6e7854d398e9bd0a089e0653501ddc SHA-1: 68c9d292a40c5a21c772c5b8c8da2f7c6fc6c65d SHA-256: 5687eb8cc502b2dcf47d11916c8b171842c1dd4b1b866855b4b4bdfc9e4a60fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic findings suggest this document acts as a lure to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e995a3b492515353356cdcb42b5209bc/47732199012.pdf In PDF document text
    • http://dachastyle.com/userfiles/file/72630755901.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9e8387ce---kataremapojapigaz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab671a1c0---97317795060.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa094bee53---81648623968.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160825c7db7ef6---52742798228.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5q8u76lkpu3e1kulc7ui8liif5/rumunozemaxiduded.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/18499174f2e51c88429e88bd80b66733/surik.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d5ed0b3e---medotulunenewuduzoro.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fbbe27e8---kidinita.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/72e69215db03a77cbb804e366fff9b2b/75560826286.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6d4985ba---mewiwuwasawunuvuxinero.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/84914986962.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/53fc02b7b5006afac635a6e6a1cac70b/69796715071.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6bf17a56c38c0b5168e938a11f968fd0/vinetewi.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/likibomevavadakuwomorowib.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6c0aad36---bopekuwabofun.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1i1nn576hi1uqtbj6utp8cdk8h/81836082608.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u320rt8nc64lr03a11d62po27p/xapokimonijibiditut.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/gejaxevojezadibazekebob.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ecbe05b9---donugurotisuka.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/39849796856.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af81afc29---45750706728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=density+of+oxygen+gas+at+stpPDF 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_off00022e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24639 10604 bytes
SHA-256: f6e1591a22d5bb25ec68b124af3ce278da75aca34d0d046efdef03824e76660a
font_02_sfnt_off00025eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EB5 24200 bytes
SHA-256: 70b3ce1461883011d2e6f5ae50f67f31a2687d4635b442e4840fc82e2f8b4069

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