Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a41e2c55a11485d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 22:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1de182d2ef987604edc9c025f3113db6 SHA-1: 835673ae963d8b137f4778add716f5ae9dc102b1 SHA-256: 6a41e2c55a11485dc475ae7263a388898ea98faf2710db76eb3904c209e54099
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://honghuibio.com/d/files/91174103424.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wagegetoxovuwok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/70549964733.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8eef286593f97889de04385a00db05cb/zivak.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/tiwuzimivuvegidi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a636a6281dd91b9216502b24215c99d6/dagadu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gobofise.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/940437397f4217f58dd70da2c26acb1b/53631425623.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/10704860136.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/57001012920.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bpkg6m6k0qt106hneqbuipef30/bofefaru.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608092e83a4e2---rixofud.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nukavilakizibur.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/venizezesegarogexalomep.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8e4b6132---zepavake.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/58015000577.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/61178907306.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/durekaberijelegobubate.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/53888574375.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/90615256682.pdfIn PDF document text
    • https://ms01bet.net/contents//files/53892892764.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8132f9f323691e798d194e961246b599/nevenewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=list+of+all+auxiliary+verbs+pdfPDF 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17612 bytes
SHA-256: f355d963144a29ad57ace9ebba2603652d762611d79214575f1ca9a1817aa64a
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 10864 bytes
SHA-256: 1441a2a3d46dfbfe2c142579cb0fc66ccffc5ba95e610c1e31b1fa0bc39ed638

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