Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3510fca0481bcdc…

MALICIOUS

PDF

105.7 KB Created: 2021-07-09 04:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f0ee9e6f6dea391b1064ab0b26c54d SHA-1: a55e365cb9d7e74efead4f115c3b646dbb25ef64 SHA-256: d3510fca0481bcdc3c535a05daf85a77b791df9d7153484dc9e6e28957ef9b81
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drafthe.ru/uplcv?utm_term=brief+dynamic+therapy
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4ff41cd2---vafikajipedize.pdf
    • http://progfin.pl/userfiles/file/83653363395.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dc9200b2edee2a494a247675ca88ce40/94108279764.pdf
    • https://zoldlepes.hu/userfiles/file/pejopamalugevume.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867763f22f8---nepupelisepugibigite.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e0db632331ad6e6d51673d4257b0ab50/57468046994.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b00d77b95---83055191826.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b60ca56d85a---43095183805.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1be02ec21a---27860353911.pdf
    • https://ptogel2.com/contents//files/sofojiwulipeduvozerubozok.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11d2db657---xuzopixuforupetexinavone.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a787e5952f---27938450732.pdf
    • https://warungmimpishio.com/contents//files/79735667342.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e16211644---74244180318.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef0a48040---24258119085.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c45.bin
08f3782baeebcc04a74d071fc89550aeb077da79c10d54e55be874e3f29a7548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 17528 bytes
font_01_sfnt_off000169e4.bin
dffb66be8ff8b1952687ce968fdd673a6a6546272d50aa7200d16f085b55248c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169E4 10720 bytes
font_02_sfnt_off00018256.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18256 16792 bytes

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