Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d941acf51a6740…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 12:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6b7c57ec22cbf05a0898c196639972f3 SHA-1: ef62b31cb94f154355ee3ec8b5c32b979a2a798a SHA-256: d7d941acf51a67408a0d03d9c2bd990708311f7fe6d97f2f9a1b65e7d90d3cf7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with a full-page screenshot. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kartywspomnien.pl/uploads/assets/file/14414334692.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/18965979405.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/kipuzexolujajaved.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2354f975---gukiviserakoluxidaxipofa.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/mebatewefesopakabon.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/56852798501.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/53291607132.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/1669968601.pdfIn PDF document text
    • http://atek-ent.com/upload/file/39181931548.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/29333315804.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/tuvenamadusumupefuxubaze.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/tovasaxi.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/12380344723.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/80876590405.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nukivosaberesodedisa.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/68943541121.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/92563737486.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145447bc7305---38753275037.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/tekesukanutuwixoma.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/fulaxufiwopawovakiju.pdfIn PDF document text
    • http://indel.sk/userfiles/file/wawomibadarewusezen.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109270252396429.pdfIn PDF document text
    • https://onlinendttraining.net/files/47484766653.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/21426574424.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/4088063948.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/25885608813.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/32dbb2262a53256106828daf9ad90c94/16198888887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hack+pubg+lite+bcPDF 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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 10380 bytes
SHA-256: 45f4e3ac2d2e5608a8d775f8260464e7110a5ad384c48917980d6bdb4ce89a3f
font_01_sfnt_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 13784 bytes
SHA-256: e579da0db47c3ccc376de749196311a15c1aa14333207fd25b1e0c0bf1b5c5b1
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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