Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5fd075eada27ac…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 07:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 17168ec8e10a3534281f615e8b46a90b SHA-1: dea0c50eb3beb3f4c86ba4548e2ed95ae86404f0 SHA-256: 3d5fd075eada27ace385b78486d90a501c5370f5d0bc7a8a99f2bc1aecc63a58
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 or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards a tactic of distributing malicious content or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://fasson.vip/images/editor/files/pujajonozepaz.pdf In PDF document text
    • http://benetalent.com/upload/files/52516038172.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/56128820377.pdfIn PDF document text
    • http://rayanchem.com/d/files/napubar.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0tbjolja6imseb28cshpstqq14/78802890212.pdfIn PDF document text
    • http://moretonassets.net/userfiles/758250874.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wolisukosedojivas.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pezapiniro.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/zikej.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/wezexokojokokilod.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fonetofejanoridinipoxi.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/desojef.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/76184079092.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/37735619187.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xipisumovedepodudojox.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tejova.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8e1e769031757f470f088ca1bcbe0b72/21855501821.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dolurisideremesasozovug.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/simakigideniwekuxojer.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/81419278219.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f846dcb27375b6563ba8bec205839803/57696295065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=365+days+123movies+full+moviePDF 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 11040 bytes
SHA-256: 638e17604bbf1c293dcc749325348348b58c938ecc597ee6e7ad56c1f61720d2
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 18132 bytes
SHA-256: 7b76a0d822ce9d7627d9f1df15d4711f1c04f1df31fb9cd5ecf377ba9425f662
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1