Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e9adcfdd1cc898…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 15:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4babe277e68f3f9620dd8765753814ea SHA-1: 61f5da0e56b87e6bc1574f98bb01fc21ab592e49 SHA-256: 79e9adcfdd1cc898e91c2d3b064edbff13e0aea91fd566c87f371720928b1c93
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 lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bouwbedrijfansing.nl/userfiles/file/fuzuge.pdf In PDF document text
    • http://german-ex.com/images/blog/file/jejagesefuvejosedatonif.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vurusisozuw.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/12705493536.pdfIn PDF document text
    • https://bursac.net/userfiles/file/12347365237.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fadanilonivalis.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90e5ccdf8---5983885143.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rililujenabatujaj.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/47894017501.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jawezir.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/negubogadija.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/13448624941.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/sakixexefaxavelenenidibi.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/timibonapenigonasaf.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/52357888601.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/vidotemowozej.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/34184540191.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/67651158873.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83885248609.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae99db06b4---tobudepimenovikej.pdfIn PDF document text
    • http://93564497.com/userfiles/41949771905.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/57848689243.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/kepumadumizanij.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wananexepuwukikepukinubu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c50574e88a0de8a7f435b3fd64b0f325/66038910786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+install+games+to+sd+cardPDF 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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 17884 bytes
SHA-256: 3033ffa51b29a315adaa2ddc6d3d7348889545864861486fd73821d1f8291e93
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 10696 bytes
SHA-256: 1703dda046bc7a2b658044be2e57bda60e4d20a884ec9262348d5fe3c0457d3c
font_02_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1