Malicious PDF — malware analysis report

Static analysis result for SHA-256 5065a50ffb6cc779…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 23:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6b9740d4172973d19227c236315ef73 SHA-1: 79f6ff04bb9a70a70499c32fb019b2b30fabd35b SHA-256: 5065a50ffb6cc779f2ed1b6d99742d1eed637bfdfb2c77109ba1e062f180f3d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely for SEO manipulation or to distribute further payloads. Although no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a-kamen.com/userfiles/file/zoxazab.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f143cd4afc---vabeg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f94210ea1---solegaluj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ea99d6adc8037152caffd01bae0b01d/bimafuralafuj.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/e0g095e0g38v8mk1nvg0tefd7e/jovorubuvojunif.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12521cccb8---latomuvu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/donidegesovevura.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wusojefamejiror.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i2cglnmchjgh358bvossj949u5/wojoriluwenaw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd494ab0ab---9109626248.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/48748597611.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/61704727065.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9q5imttofuv29vbfbfnsgt61sj/31559325262.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/borepavakofiv.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/99168455150.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/88311009162.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/gopekamivoluxuto.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606effccd8120---wazegixoxegogekizetedexa.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/29576015814.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f30504caa3---nipedazetaja.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/93080251526.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061ae5e0b61---negunifosodolisidonig.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/94639994057.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161033f13be0ea---bemomevafiwofodebefipurev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=printable+algebra+worksheets+high+schoolPDF 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_off0000c1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 17420 bytes
SHA-256: d83f89b9724e6901939a889696b3563acaf0cffcf2e53b230f42cea16a3aee30
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10828 bytes
SHA-256: 0c876e2d36f6582ab8ac4fd3a07fc5458054c2b0191094b394bbc9686972dbdb

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