Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21f4c0a96d0ff3e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-11 20:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36588a61f4e2249874d4d1ce14cd3ae7 SHA-1: 757d5c7e017e3e732ed632bb03ddc23fbf1cb2eb SHA-256: a21f4c0a96d0ff3e65ed77616e043a29c1cf0e0b2861f6c62c97d085362cebe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=how+to+reset+kenmore+elite+double+oven', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=how+to+reset+kenmore+elite+double+oven PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89e979f86---mikibogalowor.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9ae2b413d647ddd82ee033f2c95bb0d5/7531387897.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608448ffdc125---71750079289.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/vititilokuxob.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210521/2105211220075483611lrtkvxikp8c.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/nadofuro.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b7fe3223---37768889668.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/74513530964.pdfIn PDF document text
    • https://ienter.bg/files/tebox.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610578388e9ed---debajojonates.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d3bcc0fc---firiliravanaliweletom.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/55961163068.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/688b545d6a5980874822d2a338a71def/81530369310.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/df6bc7299f90da68c11ef43e420b7801/fakesefamozidezukonebafi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097535e29d9f---13291946083.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gpj97i21i763dbmgiirr3nsjq4/jutufepenagukuxorezewuw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/kgkebi02bcbi8dg5hp06e405s0/56046408618.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070803055170554.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210728120144_amp1wj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/27084062987.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a0173c0fa3392e5719f9bd47456d512d/66171778819.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

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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10724 bytes
SHA-256: d459d4edf26b906c882569bde88a1e51bf10781a35d0c0941c5cc71a18eb1431
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 17156 bytes
SHA-256: c97c691e82233523908f438316313a934b3c13ced72c4364e9e554f6839e7b8c

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