Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e2d4ca1c6c3fcd…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 09:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a27d8b9662b2a3611776f6d2a0f5ec51 SHA-1: 0d4c7860972d5213350985c29a998f6f7fd9dfea SHA-256: a0e2d4ca1c6c3fcd24fe9f68569d0f496b75aefad3c1587a8ff3616fc0578a35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates these links are hosted on compromised upload storage, likely to serve malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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
  • 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18e660182---99177998852.pdf In PDF document text
    • https://securitegenerale.tn/userfiles/file/15724367559.pdfIn PDF document text
    • http://954move.com/clients/4890/File/61661623164.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161092d81610b4---mukivejidiputadanuxu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611304639fa17---xefapow.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/danekifuxog.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/60326458585.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609790985b5fc---kenafilegoriditi.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/83833137253.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/gadatamolenoradul.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9a3c66cbd---20352342163.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a7f9ce2ee3861418e5d11f9be00357ed/bomowese.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/3891773901.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/88781977288.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49947e716a871226160cf5518998052b/84289587425.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8vb7l2e1mbas5kftaeafanacm0/38399656141.pdfIn PDF document text
    • http://ahchala.com/img/file/jilokafuxefinogifuwovo.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ed3542b9be360d1e7b24dcc6df581f8/vukirinutupamimaju.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/22427196998.pdfIn PDF document text
    • http://it-hair.com/userfiles/21724191590.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070155e48d95---24910434697.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161216df73f712---goxoref.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be9486c19---71793159612.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nonepajojavabunupagim.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015e6bafea---derifakaxomagunadidufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=reforma+da+previdencia+pdf+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 19560 bytes
SHA-256: a55b21b27c4c067dbae6de8253c6af016fc15a4034c2db2cba73bd574950665a
font_01_sfnt_off00013f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 11040 bytes
SHA-256: 1210a186800d2492d6f1bd0b2abf588fffd3ac8448a62bee6436728b17432e75
font_02_sfnt_off0001591e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1