Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d19646c00ee4e5…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 22:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef88cbea23b8e7252160f60fafc2d99b SHA-1: c98f992069ef8cec2ba753b9c75de603e865dfd1 SHA-256: 20d19646c00ee4e50b277ecf6bfdb16b7020b642715e84ee81739375a2ddf567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable domains, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=toyota+sienna+2007+service+manual
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4573d9533---15819189180.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/tumisinigerinove.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b051da164---80319730115.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160965bc8efc8c---46963673643.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/kipuzadujesuwubemewi.pdf
    • http://lightofislamonair.org/uploads/files/36614098990.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vififufisos.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c04098ae83e21200201ce1ba81cc8aad/gawulasofedud.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/zolunoxelowirefutaxaful.pdf
    • http://absolutelyneon.com/userfiles/file/57116942071.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/fifinojomabolebosobasa.pdf
    • http://maslag.eu/userfiles/file/93392554471.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/rasiveximoxizavuj.pdf
    • http://take114.kr/FileData/ckfinder/files/20210808_BEB915DE5CA8BFD9.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/20353432016.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/201db1f8ddaafebe79f598e45105db80/defatefig.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3bbb5662e8b827f145483aa164f97737/54212769994.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d0444a4d9e43ceb555b9c8be842ffedc/solewetitutabibuwak.pdf
    • https://bandotrading.com/uploads/file/90530117736.pdf
    • https://pnlcoach.com/misc2/file/
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6so0e4e3lsanp2bn2sg9jsg1d7/91334708486.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd04.bin
a46c2b433894f862f49d502036c1ea297cb51035607c75616be9cf6ca8eecf00
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 10928 bytes
font_01_sfnt_off00011683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 16792 bytes
font_02_sfnt_off00012e95.bin
109d0041df060dd18253cdead7de52e9e039e150484ead522979d1f52c70dec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 18636 bytes