Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7971e9e6399eae…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 12:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 499cafbeb7509af83ad140ecfcd765fc SHA-1: db05b23c7d4446901f04aa3a2139dd34e84ae745 SHA-256: 5b7971e9e6399eaefc2ebd398c7b66515ba3e685bcb5aa8f57b191f7d56756bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads or disposable hosting. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=live+streamz+apk+download', suggest a lure for users to download malicious content or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=live+streamz+apk+download PDF link annotation
    • http://hydrem.ru/images/file/11230009975.pdfIn PDF document text
    • http://szcftz.com/upload/wezebanovog.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161314f5c0a876---68715570473.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/silikexogapujox.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/zunazabalikowoxuje.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/77415049836.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/siwobudox.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/vimokurasubezi.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/tatuwoviju.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/7819251060.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vhokiq6h8ktpgov9hrqks0eq67/dedimipabevubovibe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139aea1fe5---98820858927.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/razetupuraduw.pdfIn PDF document text
    • http://hibertek.com/image/files/20210913_060912.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/48089304721.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgf7b8lc0md3u6d57rdv0h201e/97478870439.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/jiwojejolefiwet.pdfIn PDF document text
    • http://garderoba.sk/images/_file/vosepizukabel.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/debobar.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/didezoludun.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jezezigisebobiwavokiro.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/fomipigelarapikesi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xasofifigokudavot.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/41411695465.pdfIn PDF document text
    • 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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 17548 bytes
SHA-256: 9965064362969a2609dae958b4fefa110649caafc351aa7914446aa8c579c4d6
font_01_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 10812 bytes
SHA-256: 2d3a6e6b91af3fefe7d1548e4bcbc4d544d19cdac591e725f77b33cde011e713
font_02_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1