Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ece044fb44d62b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 18:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a09ba7faf7df499deff56aa6d3f247b SHA-1: 35a2ee3b6b6d0be5970d633ad06cce3874a1b601 SHA-256: a5ece044fb44d62b64c28a1fb5c228aef50d6486311a6a0b0683c822d135be0f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2ca3d140a5---zosoxusiroso.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0b234cda76db8f91d8a590ef09f1663d/domovum.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/jisokomuvipatido.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/67657167141.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/nefatumegesebalevawa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9059531cc5e68164f545b976b2f75212/teworobuvawo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125fe8cd0d1f---zufukudijog.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/xusetiwexewome.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/48489077604.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/60065343160.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/fumixaxe.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/jomexoxawod.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210816_75EA6FFE34D4CED5.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/manojafonuge.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce61d105a5c---jinusa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcca76c216---77342771831.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/193291983.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/68059637430.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6361c5434---56207158921.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7c0235e63---80064763024.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210815_1ACD6029D8966BF8.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9d844lr0jfeq40qgn1u7jk4gpi/vipazosedufit.pdfIn PDF document text
    • http://ccsl.asia/files/68276216930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2014+nissan+rogue+owner%27s+manualPDF 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_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 18648 bytes
SHA-256: f2939c7cda54e4ae4768e6c1c1894bc1d03a086ad86970f0f6343aefb4409ffe
font_02_sfnt_off00015246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 10848 bytes
SHA-256: 34bd72d258984f96d7f7fac1e4193b67e07dcbf30961c23fb3ae8e613f8b02e3