Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ac8b82e2e43a04…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 06:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e81d53cf8e4a6567b4f5a0f35d414675 SHA-1: f106fe9e379cf25bad5045bbb8ba8d86d6bc8ab7 SHA-256: 72ac8b82e2e43a046023443a3381b42f26d255ff882d4b2190df71dc9854f1b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to click on these links, which could lead to phishing pages or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/ravubep.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/xonesisuditekafu.pdf
    • http://fenotropil.ru/userfiles/file/buxejube.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84bb37cc3---78285818406.pdf
    • http://absolutelyneon.com/userfiles/file/86914900483.pdf
    • https://museuminiaturesbesalu.com/files/rofugitesi.pdf
    • https://bleikss.com/userfiles/file/suzivexagirup.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/37863389446.pdf
    • https://mytopics.it/uploads/file/senizasiretigawoz.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/okcpqvk2lvepei0v5dqn1is4ea/xinononuwafijedojewijeb.pdf
    • http://hwayinn.com/image/files/20210729_194853.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nagotuvisazarezibodas.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c2167ea2---kakilisiz.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0e42cc87---63309166560.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50e2e165b---vofewe.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec21dbd071---93273567277.pdf
    • https://thefertilizergranulator.com/d/files/23828682308.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d927cfab---35749489569.pdf
    • http://asiadomainstore.com/userfiles/file/55848214377.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/28893905771.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/eef8bce0c59c90f763f8f2576c31b8c5/xikowejosebewes.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4e02e0f7d0602117f0a49779ab8694df/xenuvilomebukedexolur.pdf
    • http://domeinbeverdonk.be/assets/files/file/41007244701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=is+there+going+to+be+another+season+of+in+another+world+with+my+smartphone
    • 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_off0000f758.bin
cdc2fce81bd9ba211db6395e048d9f000d2823cb953f798f46a5d2f0422d5cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 11236 bytes
font_01_sfnt_off00011121.bin
0ffeb18da1e48006e112c85c20fa982afb881e8be98035b9556b80cd7e8ec9ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 17692 bytes
font_02_sfnt_off00013f5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 16792 bytes