Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba2b18c9e685695…

MALICIOUS

PDF

95.4 KB Created: 2021-08-14 09:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e6d7fb0272bf812825e4ac8857880c4 SHA-1: d7c482592807ff1cd2ccc6c18b1ec14a1672dc6e SHA-256: bba2b18c9e6856952c9e33dfa13b084357fd7381624b34539e7a9c142b6e9741
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=preposition+of+place+worksheet+pdf+esl PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cqaqam1vfq9c9t81tpoj6qh0to/9178505880.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/63444879083.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/bosuledu.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/38798752099.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/xaxufaromawupemilopiluvu.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/41147855241.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582d1262b4---jesejeledekajoruxuvufusez.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/regajo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gk306trlmjjp6caho4j6golrqq/fukubokumaga.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pvj8afj40p6056702hrnrsq376/joforalejuzozejokigadipi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/womigexaseleziw.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/57125353813.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/rodiraxilojuj.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xiwetuvojam.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bsstmf44ho3i9csc9s00b78fi1/deniguzi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9288a6c72---11106307208.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/61989791353.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/navafuxuf.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/45916844748.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd92034024---94732322508.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/47289005535.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xupadopazelorazoka.pdfIn PDF document text
    • 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_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 18508 bytes
SHA-256: 6c823551bd3e0cad377c28ea5aa0ccb8fb92b79dccff4e0d55a839ed723c0ccd
font_01_sfnt_off00013e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15632 10896 bytes
SHA-256: ff1c9a569ca5ce386cef256aff187c5512749f04eee21941b8fe07885603ecf6

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