Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb94d0816eee50d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 11:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2043f6ed32497c6e77adc08eb7331c38 SHA-1: d428dbd2b47ba6a9bfaeaf701029a24086590e49 SHA-256: adb94d0816eee50dccbf9cfed1f4a6a49a826b9e4649a3a8b7e6d884131143b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=gta+vice+city+san+andreas PDF link annotation
    • http://polishingmarblefloor.it/userfiles/files/finekelasujal.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98761924033.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/55606176371.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613472d153cf4---12621416967.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/23510405849.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/61795578873.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/44996456982.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3opk8k6u5gokl6gsc3u9nmo8hf/98226241943.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/56796379365.pdfIn PDF document text
    • https://slotpt2.com/contents/files/13591305926.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/29502139892.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/560401414.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9754872153.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/79602150192.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614628ce63100---sojazurefuwesetufopapon.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fuvesosadawonebenev.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/snfu9ip4it8ub2vcnji5lk2mc9/fogoxulolujedexe.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/musawemakomeku.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/47317952980.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e7ca2c9---tikolotusadedis.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/51998631972.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/99356154901.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/59678362831.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/gakodajelafetikes.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3a8f25d29cb8155df70d86b22b61d2bb/7380484844.pdfIn PDF document text
    • 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 18352 bytes
SHA-256: dc92fba6338190eece732c3f4fbd3d454e9a5afa10bb9626565442ef3c19a6d5
font_01_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10416 bytes
SHA-256: baa1682f53ba88277c3ee3af78cb4a8cdc925cb1a71d95780d5f6d8dfc26d979
font_02_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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