Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b6647561e3eadf…

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 22:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c52624062c219ac3e83a0f225dd63657 SHA-1: 868a08589cab7ff43e00c228028520b7576cfcbb SHA-256: 55b6647561e3eadf4ae23541c33e0dd4da20e4ab12c4bc247d25c723c2d4c835
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The primary attack pattern involves luring users to click these links, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://pampa.be/uploads/userfiles/files/rudapiwijupexitok.pdf
    • http://cyc.cz/pictures/clanky/files/legozodu.pdf
    • http://hcvitamin.com/webroot/img/files/rikivadebaxemoxavaruxeti.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999fc3b53d4---kijekenalavo.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d8db7372---lonojunutenoteb.pdf
    • http://zulassung4you.de/bilder/file/fatilaxedawisiven.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2b7eca1de3bea2da580b2be8e649b289/bodutexuvapipaxukomoturog.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/givexoxan.pdf
    • http://cioccolatogallucci.it/userfiles/file/18354128818.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1b6921b---pedumixazat.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607939e5cce39---84842400240.pdf
    • http://turar-mussin.com/userfiles/File/40500935003.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a903b9593f4---88544613560.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8122307cf---10867607464.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63c0ad582---bopez.pdf
    • http://mpti.ru/userfiles/file/mugulu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6505c37efe---patozoku.pdf
    • https://beautyyaurient.com/editor_upload/file/20450121199.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba29df00948---tedudodom.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bim064ol928tcf5s81g8pv073b/9678568026.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5ba3d2470cc9b94064af799227a3d198/94270803348.pdf
    • https://alatheir.com/atheirwsfiles/file/79445565778.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5efe9b741c01c18d00614bc3bb34ee0d/nokedezikagagate.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22a2030ae---didezetulamomiwum.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdc26e48e---nufaroda.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/xagoburoxolitesirugaxer.pdf
    • http://inistor.com/ufiles/files/zigunudik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=livre+bon+en+maths+cm2+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffa.bin
a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 16108 bytes
font_01_sfnt_off0000f526.bin
ebd6f0cabe6419d39a277c30be5a260149ce308148ba6c71f4cfbf68ac62cb65
pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 11124 bytes
font_02_sfnt_off00010ecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 16792 bytes
font_03_sfnt_off000126df.bin
3536a5df0ff62af915fc427631e05377295a46b67852b2fa081b6f5e083ed330
pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 17852 bytes