Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2731581e6049523…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 16:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6339218fd50ca1975f42baf35ec0967d SHA-1: c8a54ebd714199570f65558c31d4940e6b86becc SHA-256: d2731581e60495232fcc32d015606ff2ac1b4174a97dce6f8749ce81f73d9955
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. These links are likely intended to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9cfbdeb618960d70fc87b07337abf508/sefiropibatoveke.pdf
    • http://www.umadai.com/ckfinder/userfiles/files/winuwurepudupexesorilim.pdf
    • http://balaton.varosom.hu/userfiles/files/53237067648.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/vanovepuwe.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/99689481058.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/23896330831.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/laripowumegosuxezuxefe.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/batubutejafajemapoweto.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kividujubozerazider.pdf
    • http://yule-sign.com/upload/editor/file/20210917190641.pdf
    • https://tyko.pl/userfiles/file/vanoxibopiviponiwufowon.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/dusexoxijolu.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210922/file/16323127975582.pdf
    • http://bernendorf.ru/userfiles/file/43531029069.pdf
    • http://komodovo.ru/upload_picture/zinewisupufaxizawoso.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/da78bae968d3adee5a50708fa57977a6/rejutafomurewoxo.pdf
    • http://radiosalsa.fr/php/rs/filesupload/file/6211326337.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/suzamuveleradetura.pdf
    • http://khangvietdn.com/uploads/file/zunimapunekavonog.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/21639624611.pdf
    • http://dcbestwings.com/uploads/files/waposidojenamixofozix.pdf
    • https://sarenpinler.com/calisma2/files/uploads/momugugurogeje.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5docf94kmflrmgl6v2vd7v00k6/62274293121.pdf
    • http://dkmmotor.com/files/userfiles/file/sijegepaluk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=custom+cast+for+android
    • 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_off0000af61.bin
e797b46edcb4c2a187b571c7c8668288604d84b44b67d02d41cb51453fd1348e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 15740 bytes
font_01_sfnt_off0000d729.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 16792 bytes
font_02_sfnt_off0000ef40.bin
04003d310c7265e950a5f4c722ece45cfc6c3d67e4fbc43d95a27f50936c2e14
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10588 bytes