Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1823169a76a8b6…

MALICIOUS

PDF

64.0 KB Created: 2021-05-08 20:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e60a24eba46f815c53f9f4eed230322 SHA-1: 0e3024d91006212f24209ee395d8edd11732919e SHA-256: da1823169a76a8b629fab2b43979c026ce5b05d8884ad5072aecadeef42703b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links pointing to compromised websites, likely as part of a phishing or scam campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a link farm hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading potentially unwanted software or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=cp+plus+dvr+password+reset+software
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0882bac63361a701583b2f123a4bce90/nijudedaxuvinaku.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gv52aklo967hvko3v87p1ja3vh/fikozumus.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d95fa0cb9---gixixipimibulewenobaruzu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/23461437cf1d4f76adb198d0aabedaf8/95336954501.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2601e514---94027086624.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/22003323618.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/n7on6k9hu82qs4mubvlqdn47n6/32839881114.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7dfc1fb1---gotif.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7465c0097349cf90aefb096edd5180f5/28852212499.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db0dfcbe8c7bc9ac061fd1b4f97559d4/salovixig.pdf
    • https://balaji-technology.com/userfiles/file/kozodijavukep.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9afb9ea7---86677470724.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160779dea3434a---jitipizituxigirida.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2387d521---63330323725.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/25633c7e2d7574620049e290b80cd5d9/28121667684.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc68.bin
6fc0f8e14058a6c5fb4d3b9bb795bf7a9ac992965f136392555fed9410b525da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 5092 bytes

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