Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887c9a64b27742a…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 01:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cda853b705879380ca122a2a2565ad3c SHA-1: 6dcb76f31bf7a95181a4f62aeae3440e612077bd SHA-256: 7887c9a64b27742ab55a8345309ac4b6afc9204db74ed8bbbe088b16791f585f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=exercices+avec+le+pronom+en+et+y+pdf PDF link annotation
    • http://brooklynsmokeshops.com/admin/images/file/komiwifawulosebavufoniver.pdfIn PDF document text
    • https://digireg.se/upload/80583117356.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f670163f8f---dukejolesaxabuwoxoxeboj.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/lixizurosamikute.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b63554a4a7d---nifenapadesasezenufojage.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/90979894565.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk3fracldaotlt91m5jf6furmh/wetuwululumarozubano.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b13f5ea27ad8f7c4b39a8fc4dd399ea4/vodepiwonobosafeka.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/makurawoputavisabow.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c22dcd7e3---xoferaredisosa.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/866729835.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/97801111273.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/datevemegujerukegeralew.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56a59639d---80286887382.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/8748807348.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/36e2072b02f447da1441ac714b06d85b/28483143711.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/segenarijinol.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/firoxosuvoxofutafewe.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/21468951291.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96294548376.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/39327546591.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/modaxu.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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 11048 bytes
SHA-256: c92e90be5e6d44a897fd3ee054ab9cf5f016e87f6018d34a68c75c12cd85412c
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 17912 bytes
SHA-256: 920185e709a5928cea115f56e4c10dc48b17497a39c76e00821748ceaae0d2b2
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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