Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b1fe24d9b4abd0…

MALICIOUS

PDF

90.8 KB Created: 2021-08-03 06:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abac52b92d1d73f6b9d10db6a50add7d SHA-1: 59e08eb872e4444f3baa1e7079723866dc529957 SHA-256: 78b1fe24d9b4abd0ef588c32cb62cc516c46930fbc5cb1a952c2cbf14fdd4e5f
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=k+park+community+medicine+pdf+free+download PDF link annotation
    • http://wonderpanel.com/app/webroot/img/file/29653083353.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/93722086213.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/68369991789.pdfIn PDF document text
    • http://hanleyresources.com/images/48804605463.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/49712886540.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/865593645.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fbdf9a064---xizufotab.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/29926290734.pdfIn PDF document text
    • http://cga82.com/admin/File/sumavebobosazidun.pdfIn PDF document text
    • http://sentralperdana.com/file/77557654197.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac247aba8a4---matafatemulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6e4b4f01---30335222971.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/049ffd6c2493b5e6c9ad90ca23325945/bojogezipom.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab29c4ed835---vafolizelevaras.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5q4bbgpksommkc1nu2bngkpts7/sovakigajew.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3b5a37ae53f30738497398c64f3c913a/84393033237.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f2c23d73---lomezutonemubosupokonowur.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bc8bd7da774491ac8f10381b3886ec2a/44521253804.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/3098380060.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/41209012058.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f35aaef4c5c452c1e7849d7c3bd164c7/91192750539.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941b0242c53---pudifuzopaloxatow.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1d133a36b1fba1b8acac0d11e4619857/19115018191.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/magaj.pdfIn PDF document text
    • http://bakoca.hu/files/file/zisojogusibi.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_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 18328 bytes
SHA-256: 75ae5ac1b5351233abf8eb40ab1d9bbd0a3c7720fe716df18da4f9b8f3f5e45a
font_01_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14368 10996 bytes
SHA-256: 932be82b950985828908ff215ad64e6b32c3dcb4776e8af5fe592e34c3b8b606

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