Malicious PDF — malware analysis report

Static analysis result for SHA-256 f469f2fa44a7de4c…

MALICIOUS

PDF

149.5 KB Created: 2021-07-12 16:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3d73736a8e58ee4ea77a62b30222e34 SHA-1: 15aa93d0d1759ed7f8e612b7a6a7b169e282f6d2 SHA-256: f469f2fa44a7de4cad512fb47a0e1865f53bb73af477577ccd7f7ce05f20508c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://myredm.ru/uploads/file/62632318918.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/davudawizoxulu.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2eb59380e---ladej.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/lazewafoxobole.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8tt1odk5jelhsbd720ot0oel83/66496285360.pdf
    • http://clingac.com/d/files/229553206.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a90e9bdc---dozasimalemir.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/29219549862.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5518de8ad---zokuzifu.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d5fa2e138310395a560e09f8a8ef4963/wukurepesimiluxavofujipin.pdf
    • http://plafondchauffant.fr//img/user/file/sipegewas.pdf
    • http://rauvuonsach.com/images/uploads/files/48794424963.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f1fa3406---xeralepisojarozov.pdf
    • http://gursakaryahukuk.com/images/file/fudomulup.pdf
    • http://vo23.ru/upload/file/14890016329.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a8019d4450c929241b74bc086609dce9/sufulosunitoxosizamatofuf.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1eedfbb9e947d79a405f9792337f7336/8026548743.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae210dec722---88276116385.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02f7e8748---xesizovorepepugoraxotaran.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889f66dfb5---74144643225.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/42346908039.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=stata+regression+with+dummy+variables
    • 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_off0001e84e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E84E 16792 bytes
font_01_sfnt_off00020065.bin
06064666234675259b56757540f87f0f120aa5f68a5de181b27f7a2e794e9dea
pdf-font-stream PDF embedded font (sfnt) at offset 0x20065 11276 bytes
font_02_sfnt_off00021a7e.bin
4198f696592cfd0a45549dbeaedbb7070f705141fdbf02f0ce13e8d77a15591f
pdf-font-stream PDF embedded font (sfnt) at offset 0x21A7E 17360 bytes