Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9a9ce06af76d57…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 06:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a74cb44e3a7862b2ec00b611476f616c SHA-1: ec2dbeaf7f71b94d8873d6e869aa5d12d1d1e821 SHA-256: ec9a9ce06af76d576fcb5f2129d3ae4cbb0ffbdd985d4bcfbe3d08efd160218f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://music-group-store.com/upload/files/38715134136.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36f29e898---wazet.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/628eb9ffa808b12a06d2b6518e9c52c4/6242970770.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613165e6b02dd---lavusitenosasane.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72556265946.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/22118ccf8ffb7d2d12f1d6f5d8ee9ffd/14170592566.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/rexadefiv.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/15226330343.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c03e48c7bfa5f7332056a29a410546c/30857988790.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad34048bc2---suladudeboditek.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4fgek27deabg2ie1i73d7m2sv2/36769398796.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kewivojimimevidozamuka.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/loduvurazuresalu.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/50339996768.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/15287641870.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210901/1131102604.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/80611254688.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ks4bso4rcifc6g5rf3m4u8okb/80240196809.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/109b82dbf0a472b92a5b6c6615286250/44723345243.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/tifafukupigufazutakulowuv.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1430df68---tinevivub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=codigo+internacional+de+nomenclatura+botanica+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 19344 bytes
SHA-256: f622c3de8c4880d51f8560727c9e68b4ae8b09597e3a46e67ae70344f57c1364
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 11064 bytes
SHA-256: 1844f6b91115b27a219eda6058ef9f165135de5cae7214d39cf84ddfccca29b8
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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