Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01c88a0646e653b…

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 04:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bb5ae02875fac0d6a6c3ca2c0e57735c SHA-1: dff79df6bb399559c7468bcabcc369aeb5ea5800 SHA-256: f01c88a0646e653b7cb87a52a82128bdb5a14af47eae9da104ecd66ae3008b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2b0b08b3---sopajotakejokodarodosa.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077c91fe4f46---wovigonifixukoxuzu.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/5326783096.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c53b45hm2rgf12duf7mg44gp98/30414648837.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tf2rjr1k39vjlbkevlnlb8n832/56327891471.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ea00bfdb---38756949950.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/feloxodazodip.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/tawavapakedeteguro.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093324d9eba2---logizegiranefakemeto.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/75458698466.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/821b8ccc084d554471240696cb90fc05/tiwunaporibunejogonazu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c469bd1316c---xizepafadeloguzixuwoz.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcc5f1abf---93877684286.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ef7e7b07---zozosilusunesovilu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fa29d06219f336646ecc088996bff01f/66239167606.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076e37a1c906---kubuluzo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/97030740614.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/826889682ff6e20e91bddb5e6df57896/lemokopowemijepegi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4k6rj6b9c48801ejr4dahk1sdj/kedemixis.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a129514c18---mokexexekuxukufujeruzovox.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7153df51a50541aa40224ff4899e14ca/zitijubibugozed.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/79791829176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf881875c---fowiba.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/20d99565a3eb22329295c8b1f253a004/80016825890.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/84be85f28ed415743122f2ef54ff7a4f/womikogunesotedarunupad.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d93cdf564537b61e36ea4404450fbb58/musaxivonusogoleg.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/lomile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=life+processes+definition+class+10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17172 bytes
SHA-256: bfe5039d5815c88a128c79ecced0cffd6cd6f00e918a495276f9b28452a24b5a
font_02_sfnt_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 10744 bytes
SHA-256: ec0936cb62c63b155b9e8de72a40a1922ba5120b6204a32e458ea36786a3fd41
font_03_sfnt_off000150e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E5 16084 bytes
SHA-256: 4e8a04f4a78fa3afc58a57d2cac5c2e1f8bf6776ecd71fe0ca93f3ac5299143c

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