Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a54666f13fe3bd…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53d310b9958016e590881a40aea58f67 SHA-1: 292e785967eb5ee886564a976c3d53347fc5a88a SHA-256: 85a54666f13fe3bd2996d56f9d16b53eb97a080c4020ca6856167c5a5f631069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=physio+integumentary+system+review+worksheet+answer+key PDF link annotation
    • http://adamlegal.com/userfiles/file/nufot.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/rarinovek.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210723/file/34818598921.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210817082419.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7fd90b035ce3816a3d311589c9052a54/34704463317.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b207e8d9b13---jexijosamuwegujupebodif.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/96145054855.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091194b2fff0---kipufegalozopidofado.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/poragusajuwixulasibofumiv.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/54876048337.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210626091953_2117423658.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/bolesufo.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/nirosozuzenete.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/69040860828.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da180d162---61371525986.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b6e53d1aa8977fb988cd24adde92a521/fitutot.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ed4cb44f7---funodevagofonoxanas.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/metanelagoxojuwegivufi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210714075947_ly6s3w.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02be94c41d---sanurubukeloja.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612072e41d0c5---22653373143.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 18212 bytes
SHA-256: 5421aeb604effe2e4d66e0688fd89daa345ebd0734c05fa2c334ad8cde51b6b6
font_01_sfnt_off000126a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A9 10968 bytes
SHA-256: f2982e98c47a723cb1d3020eeb1e40f83aab6026499a8e3efe6cfa6b4cd3c63e
font_02_sfnt_off00014011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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