Malicious PDF — malware analysis report

Static analysis result for SHA-256 375f99fcf8dbab2b…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 17:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90d40614edd255706e853740fcb0b5ad SHA-1: 69830eafe2c2b02ed9685c80dec18a53846a3dec SHA-256: 375f99fcf8dbab2b51c3b8f825a86d7f697cff55ab5191f5f442f0f000cc58e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://caphegiabao.com/upload/fck/file/99265163290.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/maturarusepukaburefi.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/jerebiwiriwosowawelo.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/95006031756.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/95711511640.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/geweburorifezugadedoduxoj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda2c913f59---butemesifotonateliz.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/86785780725.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/dolanalaterosugubamune.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/fd985ba9d63444fd15eaf3c113cff6f2/gipokagisuvadosugoki.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/zokivemavinapamutago.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ef9277896---63715623216.pdfIn PDF document text
    • http://seamacros.com/upload/file/volokefiken.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/43225888883.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae8c71a9e---tujot.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/kikuwexonojivi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c42dd665---kefuvomupudutoxilalejoxi.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kubax.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/41668000847.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/15971984588.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04ab32b64---laxoxokevopaxumula.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/83979069421.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/mifemusagozimexadef.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/62580639482.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f026e1de5c95e2672731ba22fde0a296/vikakofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=prevent+and+reverse+heart+disease+book+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 18540 bytes
SHA-256: 76114ed2fef314cd83f570ef91e11d90958513c1f054a0c3c06965105b2a29f0
font_02_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 10848 bytes
SHA-256: 4928c073839163632c7844148baa20cf85e3f6bc437d20d95cff68f8d7ec16ea