Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6d640ed96e8a83…

MALICIOUS

PDF

108.5 KB Created: 2021-07-17 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7fef2da8603e795f6965daf05fc79f9e SHA-1: 696f27863016d8b16e9da36d30cc0e0c9dc8895e SHA-256: 1f6d640ed96e8a83b43655dbcf0c7d8b725edbfee5f0a362a0bde19a3555fb34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://rolmech-strzelno.pl/Upload/file/ruxupemunujel.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160947c2d560c0---89690474030.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a528e783bc9---2469911175.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mjunhht0keqfoag9lu05j7m9or/60966076955.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/19683592659.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608936709a0d0---tipugevavenulupipaxoni.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/78956782550.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be1854902b5---bezodidupozivuj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/073h9mmtt7hpg0i06u60lr43iv/kagepotiriruf.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wojan.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/02e578e05d8865321aa22ce64c5428f3/memoribepakekufud.pdfIn PDF document text
    • https://kawanmto.net/contents//files/98041163998.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a280c704181---66333671365.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/najeligizigugago.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/90a04f6ae139dc1dd6c952cb2176ea2e/vagafetakekizikimokas.pdfIn PDF document text
    • https://placute-frana-dispaco.ro/userfiles/file/56923222889.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/dibarutulazalanizo.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/594085415.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed380ab587---148143515.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a469966ee0a3e8f5c50a5ec4f5139fb4/14243468815.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/338da51d22d43bc2fe6af1f3ecd2e6b2/66343684195.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae96fb7411---29787553925.pdfIn PDF document text
    • https://arerp.kr/data/file///wetukapogoruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=equivalent+meaning+in+mathPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 20500 bytes
SHA-256: 5f377eff55de45e8e7a7b303a92c0951dfdecab4745ca5cfa0e65df1ed99a77d
font_01_sfnt_off00015ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED2 16344 bytes
SHA-256: 774a92984a2c2ce289e4c1fe9073937c11b5533d65cc6c79846959c111d8710b
font_02_sfnt_off00017520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17520 10460 bytes
SHA-256: 5b9aef31c0159dced088ff8e5627f13543131be72c344e02f57ebec37687e6ec
font_03_sfnt_off00018c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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