Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf43aa195a75d5…

MALICIOUS

PDF

68.2 KB Created: 2021-06-24 11:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f47c2dd02cf6ab9d0417b994e1383c SHA-1: 5e30c776da57ed414792fca7ae8edc5a963cc0df SHA-256: 92cf43aa195a75d5c28a74b00256c753ff93feb3263eb592b7acbdf6cb2debf2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phish for credentials. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a9e1a960---kaxapazomexima.pdf
    • http://alfavit.tv/userfiles/file/32019166519.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b21a1209bc9409bc6ec97bd461f18d42/98460942436.pdf
    • http://mosvag.ru/img/lib/file/sizurenoxozodevaxenab.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607989d46d38c---40473672343.pdf
    • http://kapli74.ru/upload_picture/87514165938.pdf
    • https://cubic.is/userfiles/file/kufavopo.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/29b738phbuvi0p9de93n78cg98/58810149926.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c6f6ec1f8ca439973720e4dd0ceafdc/3522764964.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1vpibudh6r9pcldtvsad4hvaf1/66434969185.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb727562dae---kesosututumof.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/790037b47c2de4226e82f09ce4012998/60957746485.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855327464a0---56882343053.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3c9faab295a0cafa413c6d1d991e9ad4/43475088647.pdf
    • https://agrilaui.com/userfiles/file/33976778573.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sirujevunimotibuxuvan.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce1aba589---89397180629.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/lutus.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e1c819cb9073406b860aaab419d432bf/4414424483.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=stock+market+explained+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc82.bin
45a2ce718eb1c6be53537d3f58836e4cce1d75c6e7de8731e947de5908a40d15
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 5360 bytes
font_01_sfnt_off0000deb1.bin
f3121f0c56415182fb2a8408c8a16dd426a49788ccb0ea2ccafdbac31b3108c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 10760 bytes