Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d85e99c70ca667…

MALICIOUS

PDF

115.4 KB Created: 2021-07-03 14:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b87fd63297fd75301b6b2059deac902 SHA-1: 8255240f72b4983b7d3aff1b6461e0946c55dbba SHA-256: e7d85e99c70ca66791ad5b5de1de1f53abd2042f1d8cea36cf8a7c8500acead7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous links to disposable hosting and compromised CMS uploads points to a link farm strategy to obscure the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t0f6kes5k8e7d4hhldk6vrp675/pasek.pdf In PDF document text
    • http://peak-experience-japan.com/61946686717.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/71667286831.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0ec9059ab03ac1a13574c4342af32329/34758389727.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5948163220---weboxazolakeragevesesemas.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d4463644---zeniziwazuguminub.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/37739212092.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2447ca93---52051348995.pdfIn PDF document text
    • https://abeess.com/userfiles/file/rupiwamaliporeredunuje.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/39901672164.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/14996346481.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11e6ce4d8071ca3ed0ce340dbb332caf/40101460717.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/59707794305.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b4caa833b28dc522c2844a63ccfb8b60/zudofofexokorilosiri.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e031b9b5b9404de5a35b3b4a0aafd143/51409872730.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607312de8c892---18739888750.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/76392030428.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2417d6368d---57398994997.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dotugewozuvukukasi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/47691798930.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/tokenifezile.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7853353946---47122593969.pdfPDF link annotation
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ddrae9pd1dh962v02touqq0qk4/55934698107.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c379473593d---nulesuvonunozoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=msp+to+cdgPDF 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_off000163c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE0 10048 bytes
SHA-256: 96df9fbf15d6b734eeaf893058eb03b96990585914d23c8807f13aca7b5a485b
font_02_sfnt_off00019214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19214 17732 bytes
SHA-256: ec18e936b02fa9e0219e8669263eed4839684e03a08b4c6cbd41c860f6295b7a

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