Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d98d136cfa972…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 19:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 757c3f7ecb916cb0bc0e8a65ccafcf24 SHA-1: 9eadf88a50619c585927f8f71c93829b6e2b76d3 SHA-256: 236d98d136cfa972194d4eeb1e6c1b548a218dfb358de4c6975dd00477278051
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a pattern of using disposable hosting for these links. While no scripts were extracted, the structure and heuristics strongly suggest the intent is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://peaceinsrilanka.lk/ckfinder/userfiles/files/75231052471.pdf In PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/xafonarigerumefafixumawew.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/nifikadigemigigujokuretun.pdfIn PDF document text
    • https://menu2uplus.com/images/file/30328030296.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeb4dfac3---78275794816.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/pubomajujuvamigoseta.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/98786740298.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mejekutofeki.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wikebasakamujaxumojo.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/wepixorurefurokizikaw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca69b4be537c544bb35ad9534cfcf710/rofedojamusaw.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/2353287068.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23716697450.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/79372958886.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd01fb2385---76683625325.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/mutixofulev.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91401578219.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jelegopubu.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/wuguforexexodupususulikuz.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/kotajuzedolire.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fbba16c4---7486158062.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/5983536695.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613502ff8ba9e---pobelilizadujexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dream+league+apk+indir+cepdePDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 20952 bytes
SHA-256: 44ef96464d5a835d8ed854268aa0482e0101871e25cff2206118ffec3b5688d1
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10664 bytes
SHA-256: 6cf309781009ef87462f2d8f221275eca692445260aab1a542f047e46fdf9849
font_02_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1