Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d5b5b6c43fe054…

MALICIOUS

PDF

96.0 KB Created: 2021-07-24 05:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f1b5fefa756ca3eeb8d28b08fff0d65 SHA-1: bb2de79e29a3077004cbfb18a6a59c532581dd0f SHA-256: 72d5b5b6c43fe054a9cc2003598cf2ba255e785b62de1b7bf578897c3d38da8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download applications via compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly leveraging JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6e57251515861eb564c14bc5335c5993/66410419584.pdf In PDF document text
    • https://rm-parketi.si/uploads/majevulirokekoto.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/df3f05c847034b2c6d12c1ee1de1ff58/61457282406.pdfIn PDF document text
    • http://bakoca.hu/files/file/93244795819.pdfIn PDF document text
    • http://www.grifin.sk/files/90528296805.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fass9soal88t8ec8gd3i6tv1l6/77952666136.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250aa3f591---6857441582.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/082726n3498sfl4bjj77vd52s5/rarimukimagezoloso.pdfIn PDF document text
    • https://invest.pl/userfiles/file/34967320057.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afde4f6cc23---38687617195.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/zavawab.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/53244970301.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607995be490d9---25945926657.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0ab555df592789305c1b1cfd6b63d6c1/58654445304.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/95027344512.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kezijutib.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/71915628162.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da718a7ccc1---82729123810.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/vonabaxipimajali.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8fvftccptmav9a4n2ajff027pc/4224500128.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a3ff3eff---tazewawov.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d216dee5---savupes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+aplikasi+joox+premiumPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 16080 bytes
SHA-256: 2f1582c392244cc8e82654cac2cb77e5d9d2c421bb9509a139093d723174ec3d
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 18752 bytes
SHA-256: 3248bad4097e4ec1b84b5fb8fc5560b109a1be4d2df5ae2995bf2d232f337aba
font_02_sfnt_off00013e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15634 10964 bytes
SHA-256: 80a1f84cce8d8b1c08d08f9810b9f943ddf4d87768d2ab2baad891eeef9ee21b

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