Malicious PDF — malware analysis report

Static analysis result for SHA-256 c165e9988923a6b1…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 13:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 631d940f4277a97a68d835bc27e8d699 SHA-1: b8499a04bb0ec9710599ab8b90ef37cf5bcf97ef SHA-256: c165e9988923a6b1f0e996f970da38ee422fb93dca2023921722cf41772ddd31
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://burchiellati.com/file_fck/file/85402921863.pdf
    • http://ohana1bbq.com/uploads/files/9452715973.pdf
    • http://grawerlik.pl/userfiles/file/moranabukesekufipijavew.pdf
    • http://wsp.pl/userfiles/file/kidupiseraruvunorube.pdf
    • http://perevodvnegiloifond.ru/pict/file/xojekanijebojovafatu.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2c8ce55e5---vesipijixafu.pdf
    • http://headlinesdinerla.com/uploads/files/zinasabo.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092418306_585555447.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/91960319141.pdf
    • https://pellevah.com/upload/files/52781004991.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vepisetekazorowil.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/81805043874.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/pamemefaxisolidijoneguwij.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613255311a2a4---8810853493.pdf
    • http://isotech.si/uporabnik/file/fogunu.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca36e0761---dejolesufugagunisa.pdf
    • https://easypayindia.in/userfiles/file/86495233612.pdf
    • http://ud2-140.com/files/33698322467.pdf
    • http://jingyilin.org/uploads/file/25089888181.pdf
    • http://sanyosushiglendora.com/uploads/files/kejipiwarekiwali.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/82846632240.pdf
    • http://fivelscope.net/fckimages/rusositomimevugol.pdf
    • http://dd-eng.com/files/files/dojudabima.pdf
    • https://bankubezpieczen.pl/userfiles/file/sajidapizekaguluna.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+moods+in+poems
    • 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_off0000af39.bin
a932bf020f759c1e7a45e39aef31cae221a925823863e652159715e287e4acfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 13876 bytes
font_01_sfnt_off0000d1d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 16792 bytes
font_02_sfnt_off0000e9f0.bin
fadde1dd21d873cb2b9094b29ab8f8d1bd5505c7aa35e5dc7e9a39cf9ce7a09e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10328 bytes