Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa634a8ffcd8066c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 08:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3525ce20a0c9af0aa3492f41ce184ebe SHA-1: 1c3c101e006e6ec01189a55e198ce82ce90670a7 SHA-256: aa634a8ffcd8066c9a7fb0a4d807305df68973ad25747720e3d11f8ab2c96ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. Several embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/9118607687.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67840fa27---zupoxotumemevuvapi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355a8d29a80---81550054919.pdfIn PDF document text
    • https://wildnaturetravel.com/File/18209282499.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jarexolemururotisebeje.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130595618d19---45681197025.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/37653646810.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pk5iuhpe7e2j5v1u6qotde0ihr/65835885555.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/nusonevagakanozibi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2f8a6161---regakidusiwitunoxigo.pdfIn PDF document text
    • http://agavietnam.com/img/files/54079595911.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/tadofemewukamebirosunaka.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613cfb1e30046.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/wamuferepoj.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/42894101526.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xafawebufijalonefox.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/jatukuguluw.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/wefopetox.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/kigafaxasu.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/57944517347.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/karetuwisiwunane.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/talibadotopimonesu.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vividaseki.pdfIn PDF document text
    • https://themalc.org/files/file/80099635050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=books+on+ravana+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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16864 bytes
SHA-256: c63d9526f511cc5c9968d6b04eac42577a1723997837c59f3596086f2128e0e9
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10332 bytes
SHA-256: e84fd7188d175cbe5329240a595023352aa0c29b0c0f097efc6486a3e645174f

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