Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2720898881d77b9…

MALICIOUS

PDF

114.1 KB Created: 2021-07-02 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf8a1732c55f65aecb47cccd1f23e4f SHA-1: aacb08791a18c1fdf4c47b212f2ed82872c3dd1a SHA-256: f2720898881d77b9b99aca733c4489e1dc035b6483bbf82cce27b31134964467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb8c0d88f---72242784101.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e310fd27db---9669912806.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087d82c119b8---46293328612.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d708eb64---risajakufimegiga.pdf
    • http://jncs.kr/page_data/file/20210522125604.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/k1aks4oacjs5qe90q3jgsp11b3/25339361889.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6ov4mdnptigpql4o5umr715fe0/duzukamilegozedolubal.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/9033463011.pdf
    • http://toyotaquangninh.org/data/dulieu/files/93735270493.pdf
    • http://alibabashipping.com/userfiles/file/3736778241.pdf
    • https://rivaflo-south.in/userfiles/files/bawararunedox.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b4cb5017e5598b20ffb33a7892cd8cbc/tuzimaxezopuvapodefot.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba8f572ea---56265338756.pdf
    • https://anmimar.com/royal/userfiles/file/jimesisedij.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccea5e2025---bavupevosix.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73dbc2cdf---15012115834.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/jakapelar.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-24/20210524201933270318.pdf
    • https://fallsplat.se/file/fetupi.pdf
    • https://sgcaregiver.org/contents/files/92551699449.pdf
    • http://proxima-design.cz/files/file/rujezejuxotaxogasotawu.pdf
    • https://sinarwaja.com/account/files/40999772308.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=asexual+mode+of+reproduction+in+plants
    • 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_off00015bef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEF 16792 bytes
font_01_sfnt_off00017406.bin
01a0e2e89625c5f988b42cabbf1838a036d1b07ce7257892185e63e8e010cac4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17406 10964 bytes
font_02_sfnt_off00018d73.bin
2a4102bb54a805ddc3b6d9b6050d49271970b15c2c7b83fb275c5ef456900b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D73 17732 bytes