Malicious PDF — malware analysis report

Static analysis result for SHA-256 765475bf10aa09ad…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 17:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd8a1f10a9698acf0b81e64dc434831a SHA-1: b4c5725c6791c74256da13758ee7ae6b0cc3e4f6 SHA-256: 765475bf10aa09adb054c17753923df62259d1315258f3940f775b60ce341408
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://andlupa.com/userfiles/file/mudigodazevegidifomo.pdf In PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detowijokasel.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2386e84c---76908088104.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/27942353935.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042047489871.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/lojabawefofamimegezu.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/bowigozisuwax.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/24604135000.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/gexiruvivujulojodumef.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/89560820589.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/55598183465.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/livapujane.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/79050301105.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/76881105557.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/27df9910ed3f461a2dc3ab9dcb31cd1f/ruwipixaxe.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/zofojosazevabexum.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140012e9304e---93248527186.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rogoxaraxozab.pdfIn PDF document text
    • https://tmtteks.com/files/14569136343.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/69829540927.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5e4965b---fojikebazukonipuzenugoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=use+phone+as+wifi+speakerPDF 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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 18148 bytes
SHA-256: e1ac05903e5e67b1df55f5358ea758a2f72ffd97d96d5934f65e350ecfefef0e
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 10496 bytes
SHA-256: bc4549a950c903f5bb544e674902514f87b3062eaf030bfac31e735a76ce0b77
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1