Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b19fdca3d7fb20…

MALICIOUS

PDF

85.1 KB Created: 2021-07-06 03:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66ec799406512a17dfea98243128e932 SHA-1: aec441970164055272a67a38648ac38aff7be422 SHA-256: e7b19fdca3d7fb20e295b1dc49ddc279ec5fbe92c7f20a24a6f4bc10b513adde
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The primary attack pattern involves tricking users into clicking links within the document, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/birijusuzipo.pdf
    • https://propiedades.net/ckfinder/userfiles/files/kusabagulu.pdf
    • https://hogies.com/includes/template/uploads/file/widotinimozevukedep.pdf
    • http://curry-box-deluxe.de/userfiles/file/65687042471.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/2ecffb9f660a8bf8dba5aa46bf39c2fc/30357130408.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c7cae40bc52ddea3135faa56da55109e/fajikifo.pdf
    • http://airelimpio.mx/img/editor/file/42745595914.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4aa059280---gojegutit.pdf
    • https://tckontrola.hr/files/45340982290.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ct7agf11f5kaa2qsdcti7t8g3t/28368370986.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba70a8cb790---jupenenezidanixisajusowed.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/taturizavisegekadope.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/34c88d1b9a4f7b4097b7cc6eae743d5a/timedage.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ed566a4b6dc425a04068d43adafb5870/xenomiwilinigegaxovovaga.pdf
    • http://firegallery.ru/img/upload/vivofapufigerujabagigutok.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/54957561756.pdf
    • https://marathonlaval.com/userfiles/files/lakikewegaxotuvonakajeb.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p4affmdsaq62a8ju0luaepb9c0/sadufenoxidewinikufikil.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9fc89ee86fee6efae369f2b6fb38dc0a/20372859171.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed4fe06f8339c50dd54eaf71bcfd1df2/85729416885.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cu791vm8i15j7th0j1nnqho8q2/pofovixaradijadatol.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/394f704c8465a45ac5d7cbaf864d1d55/fageremiwijobosifebovufip.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/45235010152.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/95738972204.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=contract+administration+in+construction+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea93.bin
eee2b074c818b5cb7b2e1b527eed17a06d18cf11891a9cecb9caec3ae04f0a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10736 bytes
font_01_sfnt_off00010344.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16792 bytes
font_02_sfnt_off00011b56.bin
55bb681f557064508bd676e562b05d81a5c05f80582de7828d4f7936f4ebd9a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16680 bytes