Malicious PDF — malware analysis report

Static analysis result for SHA-256 3144cbda6f99ac69…

MALICIOUS

PDF

77.9 KB Created: 2021-08-10 08:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfc21e31347cf14e5b6b3afa53a1032f SHA-1: 73d7f9456099ae4e0d3d82ecf896514c7f418821 SHA-256: 3144cbda6f99ac69e7ba514e0cefb585465cb07f2d1b98dada642097c9c68c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f7b09d293c8d0e18d20d50a08e3f448a/24093776837.pdf In PDF document text
    • https://soalmatematik.com/userfiles/file/83448672181.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ac16f710cbdb257f7a6a9a5c650440ac/tokofeve.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/kiwagedazero.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gpd52liqb7pifpehrbp7sh6o95/46884756158.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/40838523591.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf3782815---fojuwasipegugapulofo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/27530132459.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sitigalisamisimil.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5a4dd1a5---divumizeperaxurafej.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/wasub.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607230939300a---91401153821.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eq4loqk00rtj4pi7creker7epu/28752664689.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/61384154813.pdfIn PDF document text
    • http://rapet.hu/files/13146205969.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a995392c5---dezumerarorijelebevetowi.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/rowujavavavojekonib.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cc32cb54---xuwilamupamedimakuse.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8cf3fbb5b8b05304cfc407209e0fa03e/tatejijubudamejutuzapomi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861c65d2ec7---dajonewiwaba.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/dimujimetojufana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+tool+hack+game+the+sims+freeplay+mod+apkPDF 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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 16672 bytes
SHA-256: a07ec4c5ba26b4f57f5babdb2256b5242ab5e2b5fef47508716853e7d8bbd5a1
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 11360 bytes
SHA-256: 61cbfe0d30d766d0687e9f6761820729121725fbd6a393ddb6e6e1e458ba04a4

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