Malicious PDF — malware analysis report

Static analysis result for SHA-256 128249e9bff7a855…

MALICIOUS

PDF

74.6 KB Created: 2021-10-19 02:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95cfb6faf44632f1147ab21d3cc60735 SHA-1: 6cab36d619ff278425c5487aff6f454949b11564 SHA-256: 128249e9bff7a855679dd4e9cdd237e29a8ad20d6200b4b35b30bfa630b9d88a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content.

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 http://vinhomeshaiphong.net/app/webroot/img/files/jivovakojori.pdf In PDF document text
    • https://halkapsikoloji.com/userfiles/file/masozapaso.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/datakadudazesowu.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/sinimu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d61bc03630---19694840926.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/14930797235.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/vonujasetewi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7cbda5c8cb428f0a27f6577417bf86fe/32754696674.pdfIn PDF document text
    • http://rideco.hu/upload/file/jawivo.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/9780959802.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/8027221063.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/wekemifalozujosaretap.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/38985044394.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1214081582613d82d70cfd8.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/73135362899.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lamuxakizop.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20211009_190126.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ht9nirf021e9bkfi8orbvet2v5/82055638935.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/mowane.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/gerinuzajiwuduliz.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/jisawewaworegokunam.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/mufisiw.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/73610926163.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/56715285955.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=goldfarb+deductive+logic+exercise+answersPDF 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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 11184 bytes
SHA-256: 986b9a15b957e233e8d520d6599de21750eddb156635ad3c508bcb5529bef282
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 16860 bytes
SHA-256: adf9c28c66e588a055da0d53f42a530ca91579f5e46ba14ed93706ce92593a01
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1