Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc20216e81cd0c7b…

MALICIOUS

PDF

81.3 KB Created: 2021-08-21 04:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a01d18946b11ce08c0a30b0c801caa0 SHA-1: 5c6bf62273570e888d19167bc8b4b769e794301f SHA-256: dc20216e81cd0c7ba172f6157e4ccac3079113d449c01150a527c91140129174
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress installations. The presence of multiple external URIs and compromised CMS links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://biancoacolori.it/userfiles/files/kusadiwowox.pdf In PDF document text
    • https://sportsht.com/userfiles/file/tegagoba.pdfIn PDF document text
    • http://melvin.cz/data/25463142001.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tonadofusarirusimufe.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67627549127.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5f3a414fe1588a698a9f8baadea23363/6459581880.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08ca8aadc---zivegozagukunejulegafe.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/sudenigexomivo.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/82640894126.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9fd6ee29---gixafun.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/rigowusegebonejowuwokal.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/dsjtvu5ai8i0j4801rsq75r8l2/lovububapuk.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d0da00a64---64019362398.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdcde461b---rujud.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/27956506004.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81275d088---tilesubiruwipakuxizejadim.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/goturikevirinuwokuro.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/zerokobijabizusen.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ffou9kqlpdd7k87mpccubb5b0/65216614428.pdfIn PDF document text
    • https://razredna-nastava.net/files/29723926892.pdfIn PDF document text
    • https://edarky.net/data/file/86178102542.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sewakezugovonodejufanod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lectura+comprensiva+para+ni%C3%B1os+de+tercer+grado+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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17116 bytes
SHA-256: 580d0126c21d0b66d9ce4b123912650f5bb961b7ff495169911a008944be7c4c
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 11248 bytes
SHA-256: 8f30110ba93631710c6aa48b7fb0e7e0c5d48470dc42535ded0b3217ec1fb9d3
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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