Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0263ccbc31024f0…

MALICIOUS

PDF

124.0 KB Created: 2021-08-05 18:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23be7d579c65e4fa32463a6dca403f38 SHA-1: d7734a5b86f9d67b13de2b26d242af78d736f7a4 SHA-256: a0263ccbc31024f074df28c4fe11e2320904cdfbe0277640a893d2a6800c52ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into clicking malicious links. The presence of external URIs and a high ML score strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nelly-design.ru/upload/files/62712687330.pdf In PDF document text
    • https://securitegenerale.tn/userfiles/file/rilujugoratexi.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/sakim.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/39506443351.pdfIn PDF document text
    • http://derma-dts.de/files/file/tujoderate.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5vejk817s4usgacraemcvpc28e/jitamuvumow.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/razenelowaloro.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/74ee7b4f0902fe4b024c535b93fb6e4a/ritezagotuf.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/rinuje.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/dokekuw.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/waziladimenaborujewulu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22355cd3b8---38338736839.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0371a310cfb27497187a783bd7c6916b/94920872646.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a31df0f2985---11208805620.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37261691538.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b163bf49---24818924989.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c644c043c14---wubufojerire.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/bd796dbab264be3b4d4c4cad197b85b6/25556984987.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/85027049615.pdfIn PDF document text
    • https://inks.bg/userfiles/file/64681409426.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbea66797---rarapazakolijupuvomed.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/jadamovisekebidego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=conclusion+para+un+portafolio+docentePDF 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_off00017fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000197d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197D2 10744 bytes
SHA-256: 634db158b4ea572a16754d66dd3def01d36b4141ca5ddd41d38d7a74b93fc09c
font_02_sfnt_off0001b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0AE 18516 bytes
SHA-256: 8fa44ee18cc8db15b4f8e9f9e13965aa4b3368ece04313aef9d5359ae6f80c6f

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