Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528d49e2c67b22c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 21:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574ca6f890eccebfa57ae97d50b04477 SHA-1: f5e6abecc8df4abf9be1564739aa313f3d641d53 SHA-256: d528d49e2c67b22c9a0a96682ffd5f85079e10411af6a4d293c3771b2e5e3aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lead users to malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dmaued4m7f2f7mtrtun6lsljjj/xozatedatag.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/msndprdrsc7nvnf1v4uvf54v40/24419677824.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4a42f351---67161789490.pdf
    • http://3qlohas.com/CKEdit/upload/files/kabonenofosarotamokesisaz.pdf
    • http://kashima.cc/userfiles/file/domikonibevesipedasuxob.pdf
    • http://animalscipublisher.com/files/upfiles/file/82687847186.pdf
    • http://musorcentrum.hu/files/article/file/rarobibojivixujopofifozef.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ddtfp5gac6d8qtvqkm1gb4r175/21960230657.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1e2998d4---mojawufulivilivutof.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704290c1190---rolojozolemadazuvux.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9143154b---83305483704.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e284a0c7---2736641762.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wagisokematusepobunomu.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/761962c86d5382246a2ce3a3f645cb2e/57816532681.pdf
    • http://thamdinhgiadaiquang.com/img/files/49651425820.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/diduluzilupezibel.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777c0a5d2c---wijujezatisala.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609476af01d6e---9682290643.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/xegewodoxosa.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1597a9751---lajuzutiresukawigujalivu.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/ab062503492b25a8f16ac8d7eccc635f/28636530347.pdf
    • http://eltonltd.ru/sites/default/files/uploads/56569869356.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=framing+ceiling+joists
    • 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_off0000efeb.bin
d7ac10896fb3db1297098f216cdbbb94b2fef9813fffbf83dab04bd6cdf1e465
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 18012 bytes
font_01_sfnt_off00011f85.bin
7c9811fda60737ea795d26b53f029f190b506d2fa51a9c2de27d88c2be3e7547
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 10680 bytes
font_02_sfnt_off000137f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 16792 bytes