Malicious PDF — malware analysis report

Static analysis result for SHA-256 34334a39b86d6aac…

MALICIOUS

PDF

301.5 KB Created: 2021-07-02 08:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 453db09c587abf635bb34e18a208a31f SHA-1: e76ad081934bb95acc43b30c44df0b841638fd23 SHA-256: 34334a39b86d6aac7fd367e7cdbbf4ca81131b62e5f5b0fae6c2f6bef6a53f19
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9398

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=georgia+from+only+way+is+essex
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/87b62a7410580e7cb25d503c3e9210dd/wakufo.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ap31uah2ldun0nqplmol64it5s/majobopaxagu.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/45800418625.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a47890aee31a8c86133bf5b9fc2f0918/zolowaxiwu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ea3ae058---damufafuxe.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ac118f53---75099523524.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mq1spquff5dq3focc794ofd100/88741559871.pdf
    • http://nesthomes.in/userfiles/file/firelumekaxupizesiriru.pdf
    • http://jinxinghotel.com/uploads/files/vesatudezorun.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607473209ccf3---vomototitibumosetaxemi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f4018e02---rufarojesokegejojuvatogox.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/sipopumapapozasidedixo.pdf
    • http://artechq8.com/beta/uploads/files/13948633030.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bcc34dbf77c82ca2bd6411190457c9f8/56765893077.pdf
    • https://communeouchamps.fr/userfiles/file/dumuvegudixojitonak.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b1759de8ca284c95edbcaaaa79fae452/17744701325.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071624c8ccb0---8535927842.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a091bf08---sebavafo.pdf
    • http://chingyi.tw/userfiles/files/99501112388.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7d21881ca341683b2aac1225576d5e27/meludopusen.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb98662af---41839261637.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b503cefbe5626704ff8a2f99c06a4568/75576091421.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba611b61d---vazofezukugugopapogajuma.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_off00042a55.bin
c96bfc01042bd60935a6470990f3a73273d4cebfae8d81e97af0f934efeaf3c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x42A55 10800 bytes
font_01_sfnt_off0004434b.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x4434B 16164 bytes
font_02_sfnt_off000458c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x458C1 16792 bytes
font_03_sfnt_off000470d3.bin
ac62ef2f9dd83b3c5cc7c62c16102b735294a6730967bbfdf8d1e52df8241acf
pdf-font-stream PDF embedded font (sfnt) at offset 0x470D3 21664 bytes