Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5be1a3dea3e642d…

MALICIOUS

PDF

151.3 KB Created: 2021-06-29 04:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7cdf5c5afc7bc31eb0c1a654c6311d6 SHA-1: 51786cc621afb1188beb372b9e75ea5a766634c5 SHA-256: f5be1a3dea3e642de91f52cc0324a5e8b78676054ecb0101c9498bf94f7c347e
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics indicate this PDF is malicious. It contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to potentially malicious or unwanted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 5

  • 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://palcev.ru/userfiles/file/38658044241.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1a25fae1---13517271086.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/49a1a64bc651f9bd4913af7a42ba7ff7/25653697338.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6630c9858e6ea77ba1021cc3de139ac7/wobejefobe.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ecbe49af---legafudid.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5182f1862---moloburazevotuna.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/12494595042.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1700146a7---8477930560.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6donoeujai4fq4bv8rcuob6isl/jowebefodewixamo.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/53768990836.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e3518e08a4eb0610eab5cea6038d7a4/32642474602.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/papakuxafupeton.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/170619946905508ff70cec7c3961cabf/48632172389.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e03a8ff27abd4c762e7c2c34003e6be2/bibifanomugimupujazu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b0be168---wufedajogixavibezegukofub.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084caac9bf08---21140538859.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d0f6921ucqqoq5edklihlfs11h/bimekojuregekasujewu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sudigefomafuxagunab.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d8867106754b5a1b8364058bf0ec1226/99446215488.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fdac020db6d86af6a59e4fd4d4c62bb0/68078462434.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992d315d5d8---domine.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c3e0abba2---8993745430.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/196186036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vector+space+theoryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2C3 22128 bytes
SHA-256: 90b9d81a2ee077945213bc3cc11b9aaf7c20abef959dadd2fbb8db4e15ee5a05
font_01_sfnt_off0001ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF00 16468 bytes
SHA-256: 1aba4d34835d69b9176788fc0b4a566c9c6bad1d9f915e2db21f610ce6e3d0c4
font_02_sfnt_off000215d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215D9 10312 bytes
SHA-256: b9ccb2f8df5e9a2644e087251be7ce3075b8a86d97268373b2dcf9056f6eaa3d
font_03_sfnt_off00022d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D4F 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_04_sfnt_off00023543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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