Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa58059db9b0dda6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 15:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da3b076bfb052304033942d35f75a084 SHA-1: 3c6d8f4409a3101c0a46dd391bc6c395c4561d84 SHA-256: aa58059db9b0dda6e9d05179fcab2a8ca0a778f935d1eb15301f2bc21012c45b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm and pointing to compromised WordPress uploads and disposable hosting. The presence of external URIs and embedded URLs suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a delivery mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=word+to+pdf+converter+nitro+pro PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5fb7cb47---xuvolozisuxi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6edf7bd2fc---pabugi.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/xogarinibifakiziwisa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wipiwenokogipirilibegan.pdfIn PDF document text
    • https://securitydm.com/slicice/file/kifuxekoditelojurugake.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wolifisabano.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa62cd4eb---nuvipirelukubixinevirutu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/96f13097b408b9faa90e2ca65cadac79/93238366746.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/81568863275.pdfIn PDF document text
    • http://liyangah.com/Upload/file/31251125141.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f7412ba8a---kakedagizozorode.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/6531549972.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/tarojamivix.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4o7simb19t66g3vhtsciki52u1/tadimasilakake.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9m2m69j34vb2uk51e1q41n83oj/soderazolubuwetojogagut.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c4cc8a4c05cc7d13fc2cddc9adae57e6/nuxekugom.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponomijobap.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/73273396622.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/12384722172.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/magasaziz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f7a2ffb9---68775710185.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/fodex.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/25766393873.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420aee8795---3710351723.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf94bfed9e9---77346144368.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f01734d2f---61173710018.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16784 bytes
SHA-256: 9991db9f6dd00aa7b9dfc49985544c166551bb881000160a2730fcfce54c00a2
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10296 bytes
SHA-256: 76f10058521455d8b17012d6277a85eb92e37f06afb28d41789e448710903725

Open this report in the interactive analyzer, or submit your own file for analysis.