Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7d345943c49886…

MALICIOUS

PDF

84.0 KB Created: 2021-10-08 08:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c67c8ce9725f14b36448686dd43ee67 SHA-1: 0f2e8bfec598b19045040b4b9a2529d1718080fd SHA-256: 9f7d345943c498867beb36610154a1b6ac021ae8ae03ad035353a7c88fc7abd0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, embedding numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=greed+for+money+meaning PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d64bbf0170dbf529791cffcd2883bb00/31538419991.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/sugazos.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/179ed5dbd37d7069d264399d4d936374/88225510423.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/dotonegabedi.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/94983128857.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/59678587248.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/tivigekilexapekuxoxixo.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/48530407916.pdfIn PDF document text
    • http://levotst.com/uploads/files/60706465778.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/lifumedumoxiliregivudil.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/kojajevusuxuvunisugo.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/70061138670.pdfIn PDF document text
    • http://vanhacollection.com/images/files/voniwisilinovakezakire.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316ad163782---37019517061.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/83992222259.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a4a74921dc49421fa45262e3d8be7ae5/xekiwilojulogiw.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/79937278082.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/96179923189.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29019970318.pdfIn PDF document text
    • http://vodnik48.ru/content/file/45326393942.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/wumolururemipalabi.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/moxafek.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19591950939.pdfIn PDF document text
    • 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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 21196 bytes
SHA-256: 14023c399e838ac326a0bdbf45793f2315d6ca0156c1aa86ed3d61bd402b857e
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 10540 bytes
SHA-256: 8793c952e3f19c7b18e64dfb292b340d3d314d50e6a35047a8f7e61da902a559