Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ea5f1f17fd6a90…

MALICIOUS

PDF

101.3 KB Created: 2021-08-06 21:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2e27bd0f91087fb6789433a5da70370 SHA-1: 54005d18a91d5c93f9f038d03df00ded7f92f7df SHA-256: f7ea5f1f17fd6a9015c91736f92bf7680666189b2cac4a984c5d77f80bf46db9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e2fa48a1a3e9c7ebba34832baf0c1bc/liribikudifutekoporu.pdf In PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/71338072886.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kaxabiziv.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pemele.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/86746909032.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5ca3861e3cb423f368aa7b5ce040aed1/dituwafunase.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d026a961fb---28640300497.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ginl7a9agp8hdo2t1t7d9l2ih0/40401826964.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/33286684093.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d9091dc8---lixefekap.pdfIn PDF document text
    • http://dnepropress.net/files/file/vurepavelonuwutejuruxajo.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/bafoxawoposuxotixovi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/98789119522.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/jilutoworawafuwibupis.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/97930440720.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e82d895af8013748699da21343e9393b/5102459944.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/47fc7d8bfaae779d5ceeafa242b9a83b/gakekadegasejewimujugepa.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/87435c7d31bfda3f17a55d679e82949a/47586290754.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/36018394813.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d6ecdc0eb---tomegafogadiwixuxosarek.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tosapesoviwupofavonebara.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94d208e64---86912121081.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b8cec3d6a2c320a0b3a43b3b34633175/tavabamobesawo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead9726300---vivuxilidizutexixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=halfords+car+battery+charger+1800+instructionsPDF 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_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 20260 bytes
SHA-256: 604525e1c7cf10e175370555f46e933ec2bd3854abf691902e091936ecd0355a
font_01_sfnt_off00015345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15345 11480 bytes
SHA-256: afac93b4b0a58a9f6dbdf36c95108109646f516d6170937d044d52a5550e548a
font_02_sfnt_off00016e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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