Malicious PDF — malware analysis report

Static analysis result for SHA-256 241175133bca5abe…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 00:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96613c239f5074d1b88d40482cc4074 SHA-1: a3deb5d82c8a1771327fd1c393dc61fcf2f66542 SHA-256: 241175133bca5abed9c2e707d284325b630b5dff0335f14c414492b359e2a407
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic indicate an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=clayden+organic+chemistry+pdf+free+download
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e2ff0be2825c4099b476cd8c3218e92c/30410919370.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2ec718298efb188b7aa66129f37a225c/tixatiniwezebakevopire.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a87549ad---99939946029.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/19039552711.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3lhd6995q48m9tlat9d322ehd4/xafegafepe.pdf
    • http://ats-dz.com/userfiles/file/liperelus.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed56adcec---segesukemazekirapaz.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072a59699ca9---28345161106.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f22bc8de1---86023115070.pdf
    • http://aweibel.com/Photo/file/vegugonamexa.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1aa254fcb---75774183573.pdf
    • https://aquafilling.com/userfiles/file/vakogerevuwabipajafu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e03ff19dc---xetoxow.pdf
    • http://www.asslar.de/downloads/96069744430.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9b5ec16db3aecc729d453d63b263326d/50785669241.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f90e421a343b262d8f0151aae68daab2/54622461806.pdf
    • http://lideparts.com/userfiles/file/1623392549.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb3405438---45593200225.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080232ed766c---gofezotodijedoviwosowinaf.pdf
    • http://grandp.ru/userfiles/file/81942548921.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce92f1a638b---62196604446.pdf
    • http://aaaexpressac.com/userfiles/file/3181361983.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fngneni1mdrrcpeti7orp4bt80/20710294856.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160842530b4234---44196208113.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/31913686131.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec85.bin
7ab1c72a06bf2fd0fb182316a1a5d2ca308c2089bfc817e2b8bcc1ca8bbc99c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 11296 bytes
font_01_sfnt_off000106c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16792 bytes
font_02_sfnt_off00011ed5.bin
ee9144dc1f00420eae197e0f265a7da81e09497205eeb465b7470514486b761b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 17312 bytes
font_03_sfnt_off00014be5.bin
f35702912d2c0e6278341ee4b5627168268e01f7ae19b0696d4cd6a991b6aedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE5 1772 bytes

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