Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b32a88e2d61e0e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 23:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07c0659a3ba6d05972909cf61ba16365 SHA-1: abc5bd2a41988b2ad84a814380cd0bf8fb3edf3f SHA-256: 53b32a88e2d61e0ed01442d0ea0defdcfcaffc80157c4685cb03e0fc3c823015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple unknown or potentially compromised websites, some hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://guide-eq.com/userfiles/file/20210916174535_724lyt.pdf In PDF document text
    • http://sjhrz.com/images/upload/File/82992390599.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/12585573470.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobotimaxizojamagut.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/46731622054.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/zipuf.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/48872346626.pdfIn PDF document text
    • http://acril.ru/ufiles/files/sebiwikeginuvinuwume.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/22116422489.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xoboduni.pdfIn PDF document text
    • http://samtekelektrik.com/files/xumozilizi.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jewibakegafi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbd7c13fc---767437263.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4rm1l3ts46cqo519r5s5lt9495/20642514766.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161425d8504ea8---jitesi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nedewetuju.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/18536858740.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/93301891865.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nojapatujewuvuwutimuden.pdfIn PDF document text
    • http://infosierra.es/images/editor/74779847531.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/9625556161.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/79496956762.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/zinuzoxupikaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vivo+launcher+updatePDF 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_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 10576 bytes
SHA-256: ea381725aa39031ff39c609202e5927ea1b4818b370931b2ba449e37a6cc48d6
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 17268 bytes
SHA-256: bba8bad1da083ea7adc95724283837d1207d39ce446b1600151be7ef842aec1c
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1