Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c7887c498ef9b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 09:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 740ec8cd3e030213721e2eb15f5aa520 SHA-1: dd67c64e8b53eb97b6fc365384a85dc7695931cd SHA-256: 6d3c7887c498ef9bfa3f10334239a63a094cba3cd71e1033822883a5bc4e7cc7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious or compromised URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/73f84d1e3073bfab6778968ae72233a2/13523471713.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1afc55b15---mapigesenajuzilopo.pdfIn PDF document text
    • https://arerp.kr/data/file///45537867228.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/56583313364.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/788006882.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b0bf390313a62364ab6b53ea0b8e8a7/15566858976.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3e2a8e39c---33996548914.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28543838695.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/ravewab.pdfIn PDF document text
    • https://bselink.com/userfiles/file/5513370292.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/42570502033.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/42988053180.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/47926221136.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/57066895131.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4ee217e6bfaf836fbe1d7506ed51c993/24982666317.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zulubonuvakure.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/jokeguxudiginaju.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/18133986327.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/dedivametu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f38633449287092b2958e466c25fee3a/sobubo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/24991395227.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/54679072597.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f8da09b2c76a91890cf697dd96d4cc9e/97749333377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=auditor+general%27s+report+2010+ghana+pdfPDF 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11188 bytes
SHA-256: 1ea1a172317240575cba3ded1af7c4b019268b750dcccb56e522603bec179a43
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 17548 bytes
SHA-256: 558c25f29be62de9b9e5e56d67abbd83ae171a93abaaf3d906128729d742ebe8
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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