Malicious PDF — malware analysis report

Static analysis result for SHA-256 766f91cfcc11f46d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-07 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5d3e9262ac08e562874a357f8f846fb8 SHA-1: 0550ab26b769d154f53294965ad835b88a003219 SHA-256: 766f91cfcc11f46d28f0edc9b53c7da63e3b396ad191c084afea9924f476bc93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1cdbf8a6---tamumovaxogudesiligaka.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaeb3dffb7---keliwoduwepuwikum.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/binawupigabisam.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/vjpfai8gr505jkr1p32i9oof4j/77487537570.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/82351050273.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6fb4934b6906237158bb8733a602197/gefofufiparilesom.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e054d2a694e2406e31fe361378f93681/34415317942.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/povaraperu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc2e46a1e---rovemovidukelire.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c07d5fc02---63657093517.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/04ce2b1c60146b49e3ee8e2980321aea/binafasemubezof.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0178c48c80ef004a82a4c8b43f83ebd7/4257225840.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0cb2984d---medominofizowofaluvesezix.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de7692238---7553488902.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/sekapesuxazorudutoju.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/sovasebuxurabajok.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/98740501313.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/76033464219.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/xipuxasitesoguxemefovepe.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7507c4f32b4419f4a128b5831dfe9f07/zeresi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/595f04bbfaf30350aa8229b889a4fcbc/zusebabapobexumif.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/16010336444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=drawing+and+sketching+objects+and+environments+from+your+imagination+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 17772 bytes
SHA-256: e41a5f384b3ae4a3cc3ba4d405cb30a090d49d315fd44366fe5c82bc67b3c7d8
font_01_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 11748 bytes
SHA-256: 42c8f66c79f3b370b035cfe03a0fe6d9515ac501bb14986e6ddde0fc66686035

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