Malicious PDF — malware analysis report

Static analysis result for SHA-256 644e9c3991c4e5d1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 19:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d39e660c65c3d068b5dc0398e079c1b6 SHA-1: a5ceef9b40b1e2b11e22679a5727c4a36489ef16 SHA-256: 644e9c3991c4e5d1ca3e2fcae738602480d61a6eecea0094fee223049ebc739e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=idler+roller+conveyor+pdf PDF link annotation
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/46619160275.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5fd06e0795f7381a6b97a3ad051f18d9/diporenajez.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770268335ee---wutudakevapalomatozum.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/dakosenelunex.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/tujoxitejilakajajava.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/lesepavavegezowolon.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/423b1339324d628a453096e7a2f870f0/25704713302.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/43675371391.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607387881a56d---67165775106.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6a951e9b8---subafutaxoxaxevobox.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6k6a3lp650dbjcl4b10c914a7j/85143113239.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/50200230103.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/95482286829.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/kerogirotekixuwi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wazibawakubikexido.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/808mmevg2nds86j9sc433vit84/boluwa.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/92b99b7a9db29cd4fd1e5ce47ac1a4ba/toxugimepet.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fugakilik.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/47958208275.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747c2685516---liwevo.pdfIn PDF document text
    • http://finchamauto.com/pics/65107671513.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kabivebugak.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/17105365909.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/42568452539.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/80599488132.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 18568 bytes
SHA-256: ab0ce88243b3069ef8790bc9caf6ef78b9107aef560fb14841c7ccec0f9d2887
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10224 bytes
SHA-256: d76ae5649d4615441e605d5a9fea1b0774ce546f9da54f383e45d8a29f6c75f7
font_02_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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