Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dab560f422cced…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 05:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb55463837eae881270d58572173ba55 SHA-1: e63c9bb73c207c67182fe47f62da48078680f88e SHA-256: d8dab560f422ccedd9f33cebac6f5c363f165806d3bbde171ae6a220a55c6471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be directing users to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/37315477327.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160949d807aa5f---pipoxegurixigegebe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090033ea1ab4---67189300088.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/89730273157.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/12270287218.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb136ec56c---ronuxorepufatose.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/18097108747.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/d642en39o10h2mupfl1g5ror12/vidonudi.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/62691528695.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mubowizimawopogutodurebi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/povoxusuwes.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/8563988717.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/irnqr81bicn4kescchuilnha93/bebote.pdfIn PDF document text
    • http://modern-pro.ru/files/file/kafaboxe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c215871b46a---zodedanexegibenagax.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/zererarelazipipojekujamum.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612699de653c3---60083098998.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/dee167e6c8884e4f3542b66f79726dc6/xenozobodoxula.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb04ae58e05dd8170b653bb6c7be6568/karejerokevifejibepogex.pdfIn PDF document text
    • http://bulmarconsult.com/files/48671747223.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/27610293916.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028ee177e0f---rulefujusevax.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/kanadutigexixaburiju.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160759819952a6---sidulupaxevawimixinopizir.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/zinedapewupusawex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=do+not+comply+meaningPDF 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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 18140 bytes
SHA-256: cd591bc32fdfdf43731337f1da7f8b82cf4333705cca9b14dc76b18db4b06d92
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10564 bytes
SHA-256: 29c6c0291ac95a8e3e01b150570ca4895ec39e30609a40fb2496620836fa45e1

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