Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21f540e07868974…

MALICIOUS

PDF

93.2 KB Created: 2021-09-20 00:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 377c3262ecb6dd1d6764088b9d57ea56 SHA-1: a59890d0bf487d741fda3aea5311ba05865aca71 SHA-256: f21f540e078689748296d0b354b91e69d929dca76d2d81fb3a737f84c052b737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=prince+of+persia+3d+game+download+for+android
    • http://grancanariacomercio.com/documentos/file/balune.pdf
    • http://xn--lv0az70cxar.tw/uploads/files/202109100037498045.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/13a3f81cde7d72ac34cc0f0df37a8518/dedinavolutaf.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8a8c259ed4f958a37e538226b278aa8d/82458256010.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/31896276611.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614530d91fee3---62982668738.pdf
    • http://langeline.com/ckeditor/upload/files/laloji.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447b6066e7---jiluzigixisemazobowuv.pdf
    • http://girisimcilikproje.com/resimler/files/4857178071.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/xibebubazezolipetogopom.pdf
    • https://0900107678.com/upload/file/napibaf.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/xewidaludipuk.pdf
    • http://location-appartement-venise.com/italie_documents/files/zabebum.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614456881434d---9134857930.pdf
    • http://stoka-saarlouis.de/userfiles/file/xukozutilasageweruriminon.pdf
    • http://files.ibiza-ferien.de/file/tikewutu.pdf
    • http://techcessgroups.com/userfiles/file/pumometazuwosejasowap.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/xikitawaforufex.pdf
    • https://skykharchono.mn/editor/files/73673904913.pdf
    • http://kursadowicz.pl/Upload/file/56640451869.pdf
    • https://nazragame.com/calisma2/files/uploads/rizunawafo.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/71311667092.pdf
    • http://proxima-design.cz/files/file/52428030781.pdf
    • https://sausalito.com/wysiwygfiles/file/tagisixowalasozedanoj.pdf
    • 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_off0001034d.bin
22eaf71b27861ac7eef9db9259c1d681f2f350b944966ec24b1b3decb025af49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 18976 bytes
font_01_sfnt_off000134eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16792 bytes
font_02_sfnt_off00014d02.bin
fde6854d2f13e456a57bd31b5010c34d9446370f278240e2b9fd5c30535114c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D02 11124 bytes