Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df75a4632cd98c2…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 00:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdfb6574d2a0a7a1c16e29b7edf682ec SHA-1: 17982554deea4d37a29dba33077cae24a22b5ca6 SHA-256: 9df75a4632cd98c21ae9a7e42432da0945eef8d1b8577935abc24f7ed66d2d31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's designed to look like an image, hiding a clickable action to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 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 https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/enkae9n54u1js3b4abkvbenrp0/64049005773.pdf In PDF document text
    • http://joeun-it.com/userData/board/file/62880992220.pdfIn PDF document text
    • http://hanleyresources.com/images/bolenewalaw.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fagizet.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/31638172199.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/sikekumodu.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/mabug.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/51123886629.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/78036252415.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/woriniwuwifelodibuderefij.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/26771573440.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/7642794446.pdfIn PDF document text
    • http://nfc.soo.jp/file/56572040816.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c3f09188---daborodetu.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/72750096998.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dijusotir.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/wuzepenumeximilej.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/powosaz.pdfIn PDF document text
    • http://afro-safari.com/upload/files/jojanifebifew.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/zazibejinabuwib.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/77171478324.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/fawovovowenokavexadawe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350dcba1769---migofatomuxixumejufapizos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=forza+horizon+game+download+for+androidPDF 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_off0000ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD60 10656 bytes
SHA-256: 252a9e66e0af036eb642f2faf6dd5c1f16cd8a65d7739686268397d7fa38ba0a
font_01_sfnt_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 14076 bytes
SHA-256: 62553f18975bda1c76c2bf4824049d19642db39922347f8fde184558aebfb95e

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