Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb4d0421dcac112…

MALICIOUS

PDF

92.0 KB Created: 2021-09-04 19:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c67b316959463e4494475a71641bd39 SHA-1: f4555e44d39a52711b5c7b5d5fc2948d16cc3b0a SHA-256: 9fb4d0421dcac11215d2283b860e6a5389a79ecfee5aff5159ee0d8391fadcf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a collection of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://stark-tools.ru/images/uploaded/60257588102.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l3h8krksv6v0tpj3t36v8pul61/16716807011.pdfIn PDF document text
    • http://artospace.com/pics/file/28519603793.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/34265733024.pdfIn PDF document text
    • http://strandedtattoo.net/file/96654743225.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160da9092c5479---jivakatob.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/88823209890.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071dee207682---41070005493.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/xovalidofoparuda.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tuzutuje.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/mudotoruledenoso.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/kavimogotadovedafit.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/katinabutowofubaviludowap.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/93109899203.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/52205069127.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b98313c053c---xaripavenim.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed28479356---vozokofapuvisag.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sanudopapeburenasutan.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/sugesepebobuvuzakulad.pdfIn PDF document text
    • http://hybsch.it/upload/file/39205348224.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rq50t6um925q02k4mggtlq1vqm/41390301896.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/64861808084.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d0fa3e758b18c7b80fa238384b73a8be/65809294661.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c636f08---ramukenipuxonekezimi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/putitugimogepipitag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=air+conditioning+maintenance+checklist+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 11140 bytes
SHA-256: c8cc0ae2ae09dc9ab71b77c1ad384de5f6e7b29451441713b170ffa413da0dbc
font_02_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 17940 bytes
SHA-256: 8f8ee64ee9e53c708f6f650fd44859a972b0461837c524bb9b484ac25649a49f

Open this report in the interactive analyzer, or submit your own file for analysis.