Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a70fd891c534334…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 04:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3decefa2bc9f45d5bf22205e2107c6c3 SHA-1: ce2e1e91b5d2a8249931263a9d56b877c64831df SHA-256: 7a70fd891c534334005bb683c04fb58468e8134d0735148e3a37f2e36c89b3a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=patterning+worksheets+grade+7+pdf PDF link annotation
    • https://zahrek.com/userfiles/file/poponiwofasaxi.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/fitepa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3906385898.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/73739356051.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d20d64670---dejavag.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8928360c3db789b129c75bb03e00f05b/xojodilapalel.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777de7bc18---52578994857.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e817b20dc---61771001473.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f10562c5---xokuzisunajikifevasedot.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210730_80B3F648FB3EFA27.pdfIn PDF document text
    • https://primer-spb.ru/files/files/92850247301.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jafupiba.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/38535103675.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b997eae236---sepuni.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49716771534f7ef7fb07bd1563237155/tibodapu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c05598881497d9adf20b0e190f949e6b/2465256064.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119b82271967---finopigo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/tekonigujujinu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddd2440b02---bowawukenimarozopovolol.pdfIn PDF document text
    • https://rintrans.com/files/24390794688.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be69fb7b17a---matago.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10960 bytes
SHA-256: 5f122a2dba92e1dee6766bb9f7accd3925fed4797a0c8583488a01fa5eaad429
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 18424 bytes
SHA-256: 4c83865aaef2c1cc4ebe10dc804dcd7b32d72db0f44f17359b853a213ed42b1d
font_02_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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