Malicious PDF — malware analysis report

Static analysis result for SHA-256 920e21b579457aa7…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 21:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acf875bfe4eda0023ee519e16057c516 SHA-1: 37604e5edded1c7b01709c9ab674d9fe4cceb94b SHA-256: 920e21b579457aa74dc913b8a4a7fb5c8a32b54a72accfc4d08a8cd684e64b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to obscure the ultimate destination or to distribute malware. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2ad7576a71f32bf761eafcf9da56f5b8/xejadijidegigoxelu.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/275ad88e4244582d9625aec93ac2e60d/55405191422.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c4da444bb51acd32eaf1e9860e718ada/77798851892.pdf
    • https://brod-plovdiv.com/images/pedewamugakovex.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/912bdaeaa1ed8d5a83738305ac6bf1cb/50989124154.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vfvvg2heu08topci5qagrctfq7/20707958572.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/tb8p34r921s2tqa45vpoc7fsnu/98448786306.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/kulana.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e90963e0---kedisodesotozenizik.pdf
    • https://dock-levellers.com/upload/files/29554313455.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a54ea72---medetepeg.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160973116f3876---40758354614.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/382bad6502df6628557a128a9b48d1b0/zudawekemer.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/20320b28adcc287e05953e0c14209cfc/boborofevujeti.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c4db716ba436e7ac6c95c45feda0685a/85228201452.pdf
    • http://slsnn.ru/content/file/bigatusulilijotexewu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4b935da355adfc7d7d10bbc526053659/93241841141.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j8h15t1d673s2oh3tq3uc2it84/jariluzudoruf.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfeb184bd---82193333254.pdf
    • https://almuhja.net/ckfinder/userfiles/files/xujexewevaxibev.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c4958voh09ud3q4o0i08dlbv8q/dopinad.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/pifirubito.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23cd9e4d1f---6202135783.pdf
    • https://walkandsmile.com/userfiles/file/vuvafazoze.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb5b50713---32432186432.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d70ccb43---joralatavoteguvupif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mary+j+blige+everything+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e4.bin
1f211214814efc8e18d75b291cbe2f20567a28e4cac0be5e9f674f71c08e46ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11372 bytes
font_01_sfnt_off00011312.bin
8ef1cd34ee059608d5068c881876fcea3560a0283d7d07bae13d4d6bd48dfa04
pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 19072 bytes
font_02_sfnt_off000143e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 16792 bytes