Malicious PDF — malware analysis report

Static analysis result for SHA-256 c519192659dfdf69…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 07:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11cd40640b7655d4f82dd6af3acd6346 SHA-1: 1479b9c9683f43ad00891f61680eeabba1d0fa70 SHA-256: c519192659dfdf69509090cc625dd42c57b4a893a45cfb167db8ca51ac7df633
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites, one of which is hosted on a compromised CMS upload storage. The primary lure appears to be related to downloading a game, as suggested by one of the extracted URLs containing 'pubg download for android highly compressed'. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cresapumc.org/files/file/47455280044.pdf In PDF document text
    • http://marcth.pl/media/fck/file/25686085092.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/54143574677.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/liginozinuxateti.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/lapisavojufaloxuputa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nvta8qdrrtvdq5uegdi4b30e3g/2319731011.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/86823188150.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8f1605bec4122c9b6cdae6298b460346/namubuleweb.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/78099668968.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_23D6BFE5BD91C968.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/14759461260.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/sulizofuzugagabikogosog.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/23249018745.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/namujofaten.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/mofepovovewetor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000e5b1c85---53968694343.pdfIn PDF document text
    • https://codecs.ro/images/file/gaziru.pdfIn PDF document text
    • https://ratodua.com/contents/files/runofukulesowuvoxi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b8d18be7---fodom.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919010120.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/fazejesevejo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/73444220688.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/62790537056.pdfIn PDF document text
    • https://granitnet.hu/editor_up/41804284237.pdfIn PDF document text
    • http://sbkf.org/files/files/69537216917.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/juvizitivezusaraze.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/vuparozaxuzevoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pubg+download+for+android+highly+compressedPDF 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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 17408 bytes
SHA-256: 23704c3c59b957bb97ec8eaf3a288a4b9632dc66a169c36f9c79390618d9aa1c
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 11412 bytes
SHA-256: 8b3f64d18405f62ee4d5ceb4b55ec1c4d9f4c5c0bfc9b3f1a77c517ad612499a
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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