Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba87ecdcf3fc1e63…

MALICIOUS

PDF

93.4 KB Created: 2021-07-02 03:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd7c83afeb2a8114015b73bdd5a4a951 SHA-1: 38369bc86c4ca8d7a1fef9fa68f20a4c46949ac0 SHA-256: ba87ecdcf3fc1e63a2ad3ea6c82e00bbffb0fa2ab396deafb4af891a02c0db26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, suggesting an intent to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://baraanduliaptti.org/userfiles/file/76173527393.pdf
    • http://anpo.vn/upload/files/lexiwopijumowodoxukuguxod.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4be4c202---9388498164.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5fd3e34a---doxaxijalevude.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fhb8o00ar4t0vtsqci73tjur76/bixopesop.pdf
    • https://activepymes.com/pub/file/58580395743.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/67522726b32ca48f15842b0e52826828/97628386159.pdf
    • http://cuakeobinhduong.com/upload/files/tunuwudolemikuzadumeza.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/25aa0f78d05a2ae1d16609abe3006fa3/77056270056.pdf
    • https://bbpartner.cz/userfiles/file/ritibod.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f54d09da---33485025399.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b00dc7e1278---34595958401.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4b4gamo7ittk04ajsmv99apijc/10307329983.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75f05e26e---60887867668.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/85737895605.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b03e7d12---78200577603.pdf
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/43759965172.pdf
    • https://cbconsulting112.ca/userfiles/files/tebogugumuwinesimuvur.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/488bc1357395bbf9f968642e375147ff/lubosuxasemanexigagaxut.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d41476772---95962897460.pdf
    • https://alshamiltrading.com/alshamilfiles/file/11958128988.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38013897a---galezexoxe.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b700204c3---93357629787.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a08e4f223a7713bd1d7ab936e1d615d2/sutiromelaresu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=funnel+web+locations
    • 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_off00010a73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
font_01_sfnt_off0001228a.bin
0f54124f691b1dcda522a2338865fdedca6cb76ed06934a1dfc000fbde49867c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 10424 bytes
font_02_sfnt_off00013a5e.bin
606e8190635bb5dcbb29f16e6be51f1bc71ecd9eaa874836266c8f4a16c39574
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 17824 bytes