Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cdee8da2d60b61…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 08:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9186417cf4ff42548e2f072eb45eb55b SHA-1: af24059ded41ef22acbece0600997733cefbe546 SHA-256: a8cdee8da2d60b612e67223ca6029d4d8fb690077952972200a4011e6cfb2c68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing lures or malware distribution, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://laborke.ru/uplcv?utm_term=dirt+race+car+setup+guide PDF link annotation
    • http://hataylezzeti.com/resimler/files/rifemovug.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/majimurojudusuwinaraweg.pdfIn PDF document text
    • https://media-get.com/userfiles/files/zutez.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4c6e470ca239a02f2945aaa2580695d6/94645605229.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/geluworunosatuxolowamuz.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rowariropukakivopepavat.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/risovod.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/58354312980.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/pukitemibupanisipumudixa.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/lubavunutobowi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xujagodur.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/pimapojulekedinewovuxi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f2abeb44---kavedapugugiti.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/56058d017c29cf12cbfb2ab6c7d56ed7/jokamuvuxipaxedakojapuz.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/leradomi.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/56584045785.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/78533bcf7d536aa6cd3d324a07f8313f/vedakovafosoruvufinolituz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/se6t4mil879o7kal071ak81ou6/4548105684.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4022b1c50d1a42a1d2d61359b666c06f/zenupewusuwivofujepik.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lowusejura.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d0b36be---94133086689.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/edff6332172928f1211556cf7a2cf9c0/lepurukuzapobigolujavedo.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/32542737435.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf3d2eabfe6839127955c165c29e7b03/furaluwuzugiperiwu.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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 10520 bytes
SHA-256: f9a6a249bdcc54c3a45226610d24e3aefc3b93cd75561b7b528e0d804b64fb20
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16300 bytes
SHA-256: ee7533d27a8fc1e9b4a3c96f8d370472059b7d6f5c51eddd0f0506bb0a054439
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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