Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d138489834e5d43…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 22:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4021dcfa0fb872caf83256e9839183c7 SHA-1: 479514d5febe74385995c306b013821aea16023d SHA-256: 1d138489834e5d430180a8f3411f40037c08c7b8af1df2ada9b3066da114debc
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 disposable hosting or compromised CMS upload directories, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=pelicula+baile+urbano+canciones PDF link annotation
    • http://fwullong.com/upfiles/editor/files/vejuxadigeronep.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3a614622635f4df290da221301f439db/zuzataxesek.pdfIn PDF document text
    • http://mesterek.net/tmp/jelifutubitoxifewujip.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/91154545231.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bee0ba28---40314903659.pdfIn PDF document text
    • http://uci.ir/userfiles/file/zojozenobipekasel.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/tujutezebeded.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/80483538237.pdfIn PDF document text
    • http://fitviewer.de/files/file/79027236835.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-8/20210708092836216608.pdfIn PDF document text
    • http://garderoba.sk/images/_file/67520061215.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/19138713970.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/95796996841.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9831923d4c86d19261b6912e4dffd0ce/89104792268.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/buvomukuwegikarokeja.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c23281f3c---mujul.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/1262161013.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a827423fa6b---wezomevatodilapajumezol.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/davuje.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/88600452988.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kolupupabatura.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c9973ded---guguloxolusogusuvuvuz.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_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 17772 bytes
SHA-256: c2bd6a86387d31a2b9e612cec236a805a36ac355f5f8bc57c6464b88291492d3
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10368 bytes
SHA-256: 5ee752538331d1e09793e7a2bef67ca214797f6dd9411d7d2fa600092c938c87