Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfc1521fdcbc778…

MALICIOUS

PDF

74.0 KB Created: 2021-09-30 21:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75db9a2a94813d3ed5e369e3ce42d233 SHA-1: 6014c67bfef6b96cccdea96a38880f2ac7469b54 SHA-256: ccfc1521fdcbc778718106db027c4cee2467386fc43711395359b68bd008d3c7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vasekurzy.cz/userfiles/file/gufofipijuxaxe.pdf In PDF document text
    • http://kayapaliinsaat.net/file/45161718319.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/jadadorarup.pdfIn PDF document text
    • http://langmypham.com/luutru/files/lapeto.pdfIn PDF document text
    • https://vzduchotechnickefiltry.cz/docs/21089247279.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/2522681852.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/60878360764.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0506e431c43e2cabafaaa995733e77f/3996406958.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vajakumamerojubizuxoruj.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/zejijumin.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fikabelodugub.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/71017290765.pdfIn PDF document text
    • http://darec.sk/files/files/79324893274.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/jokumow.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/27107440090.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36193763842.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/mowosojejomameb.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/43662670669.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456f868664f---dovirigiropazize.pdfIn PDF document text
    • https://2winit.com/Files/files/suxilubumigititelox.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lufoxawagixijekufunovuro.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca314a434f---64965648123.pdfIn PDF document text
    • http://ed-union05.ru/files/file/17016323615.pdfIn PDF document text
    • http://355353.ru/userfiles/file/jakojel.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vutifarutekolasadik.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/80156244190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reboot+redmi+note+9+proPDF 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_off0000b99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99B 10560 bytes
SHA-256: 1d7442a2a46083aebf0ca64294fe2beca8bf5dd1bf07d952df4af8cbf3415ad8
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 18904 bytes
SHA-256: 4e30b0fe8fedee5d9f7db7773a004c6d526fc0a8174115487a948c8fe052cfc0

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