Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ed175c3e471a5e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 23:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a13d614db70c5b2e5e88530c0029e7be SHA-1: bf693222d0e0dc079853f0f8cd512a15dce55525 SHA-256: 96ed175c3e471a5e345d56c91b243c71a917d6e563516abffc7a0e3ba245d1ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially malicious files hosted on compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clinicaveterinariacittadivignola.com/userfiles/files/pojega.pdf In PDF document text
    • http://hzaidele.com/images/upload/File/40364513962.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/kaxasevitar.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dinuvud.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/subefepatimuwesuxujixivu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c3413277ad841673908e0fde7a4e7a8f/pawovaw.pdfIn PDF document text
    • http://devveb.net/userfiles/file/29042967736.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/85358694219.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/84454253309.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/kewutoni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b13dcf093---muzuzuvidufodofinavowogu.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/76650066538.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/36757823755.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69152731378.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/41474043685.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/84770249218.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/avbc8qt7o8a4b4b7cv0s8dneb5/puvanisajuxovumi.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/ruxenolu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/xomuvurijaborajuxunudole.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/1054912157.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/16594725904.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/kopolutowir.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/jaligegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=videopad+download+apkPDF 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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 10164 bytes
SHA-256: ebf8aa712176eae250af2c094b2d6b6709eee5a01ff1cfc7ad3bc906ab29f44f
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16960 bytes
SHA-256: 7b89387877b1f94339ebdbff2323c3ae944e80ed63408d478f267a73cc6eb984

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