Malicious PDF — malware analysis report

Static analysis result for SHA-256 01312f9a25a7f31a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 05:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23aad51a184656b0d770eb0a56659ad8 SHA-1: f9aab69cc39683358c32f34341240141cc3b685d SHA-256: 01312f9a25a7f31af1c89610f83b7d6be01d47fbf23a57defb54b7d345b2286b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload storage or disposable hosting. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bodymason.com/user_uploads/files/60661918970.pdf In PDF document text
    • http://potya.com/lotibulilokajumonanike.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/60922298362.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jewamewokizoraranukab.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef75841cec---lozuniduliledofevotamin.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/8399013353.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210914095102.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109042032153773.pdfIn PDF document text
    • http://livestocktool.com/d/files/wujokegirodu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5m82lo1qmgm9clvmen2s871610/46730861695.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/mosubom.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/8492120770.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/medaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387e4d4cf38---76916450072.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/pakalujejir.pdfIn PDF document text
    • http://savemaxint.com/files/file/tebonuwulis.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/nofifasefetego.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/nebivewegefob.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9138034738.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/tapudatulovikodavenuru.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/14185687344.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/wawomowitedogi.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/74145962884.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74886970885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=proxy+bay+sitesPDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 16172 bytes
SHA-256: 6886519bd0a20ab4a5c3fecca11b8702c148d0f36d80fd59d702c972654f1da8
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 10308 bytes
SHA-256: cd5c5ac467c43936b434c1401a8ab6ffcfdde026575830da8a60d0dcabb95a46