Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3f4ca755caab0e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 17:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 078fc63ac1ee06fb36c09286b1e2a64c SHA-1: 50efcbd70dba8088edf01c0041de095f4bdbd9ed SHA-256: 3b3f4ca755caab0e3817c0d3e1d68a2916c3e23d388d4cd38c05dc281a563d84
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links to potentially malicious content suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27ea6787c9b2a72607da5a18707115a8/76298128883.pdf In PDF document text
    • http://luberoff.com/userfiles/file/magenomazijozudix.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/23833472656.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rpadb48qnl728m7q25gbf7o523/34054906288.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r7t48jj5c13dpp0jp4pele9es7/furaroregosuwitezon.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb45319e4---pofusupekivukeze.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/nikotirokejopuba.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jheoln4itt0c8orelurslb30g7/vovidirarelamapo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3b5ea670d---givuxikotafasisofolamapat.pdfIn PDF document text
    • http://abnicum.com/files/file/vugawinogiwiderex.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1c62cf0f---joperuvenefepudibetin.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1c5bf59089a2a035a4c5e0ebc5e0a8bd/lonagigiminopasutajizesu.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/66141652988.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/62426261863.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/27730912429.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/74939633980.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d8pb5it8nn03ocub80qm4fvub2/65713501734.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6b3anf7nbo976m543p1t90ktg4/93598898202.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/347bdc71e363dbf822526f67b503b2a3/36830296743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3468e031---35439371199.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/penulukevipipapopeguwat.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbgng30vqmjud1bb99h87rslu1/45885489499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=death+duties+meaningPDF 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 17892 bytes
SHA-256: cc56289ffd5e4bf285936ade0a34cce62cc8595a825aeece6ef72618ab0f8a3f
font_01_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 10532 bytes
SHA-256: e55c9f18b274a82d2672c4c38242ea7c714374c601c73b9d05503d8d902b3908

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