Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ee41279e620e40…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 20:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2dcdecd56c8835e7ae42afeaf2465c6 SHA-1: 3f9e64a47d7e9ecfec87a688ee9dbf25bb0903a6 SHA-256: a0ee41279e620e40c09a5f43b32cad1ed5cc70bb3c927913932a8cac0990d4ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous links pointing to compromised WordPress sites and disposable hosting suggest the document functions as a link farm to distribute further malicious content or phish for information. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript facilitating the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nawaress.com/webroot/js/ckfinder/userfiles/files/nasokiwo.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/09cb5d56e5e35ceed47adab48b3f8571/59428921064.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4c1c145e---jiluzubokameto.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da33b3c1d7---nawewafejupinapatakite.pdf
    • http://momsystem.ru/public/file/kanewewuxuvarulisunavuz.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/vgc6omrs7qvvqlih77ickej6g2/89902786049.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f913b3754553810b6e289c7704661e45/sonuvo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68c1762c3---xijopifabebizudumujalewux.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pbvacfqj2kbuqprhfq9q0eutk3/makemidaxakusaxugogir.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/98d009f508109ef79fd9d3035a592375/lotizivebubozegitonis.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087315dcf0ed---jigatekukebuv.pdf
    • http://atenngo.com/admin/sites/site/documents/nesuruni.pdf
    • http://dieta-plus.pl/userfiles/file/kogaxizusin.pdf
    • https://epiphanych.com/images/file/53135405807.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/373274cbd622046b7515d6450f7fec08/banibo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kq9u94p70hj3pte9lrg1ge5aeg/barulowase.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ktgqh8hqv6ohj7vpbht9kr6f9v/68834870147.pdf
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/vigolulukofof.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8f41f7fa940cb6c25ccdea99e20dbe91/45644015999.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/70ea980fc7448c0627fdfb9c499c22af/momomarofagefunarupop.pdf
    • https://bouveau-consulting.com/userfiles/file/muvoleluxajojo.pdf
    • https://mimpiindah168.com/contents//files/37984451556.pdf
    • http://amtutoring.com/clients/865321/File/bewopukebofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3+parts+to+nucleotide
    • 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_off0000e578.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 16792 bytes
font_01_sfnt_off0000fd8f.bin
11905492e4eb110f80bdcbde832b4f3d3d363f5e5a3344a39b3e6cf2424a18f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10684 bytes
font_02_sfnt_off0001161f.bin
56e06a4dd36123cb0567b21e0d0f6812ed2864d85a9766712423c92a956c0050
pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 17060 bytes