Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3376583b88333…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 20:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0380daf498cf96cb4820b39ab3ed5c88 SHA-1: 5ef6174c7448f60c4c14b61acabba0d71af308a5 SHA-256: 6cb3376583b88333d10b78bc940941cf15c4c6d0f3f0b383fe666b4351fdf288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the final destination or to leverage compromised sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=biogenesis+theory+pdf PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e2b8d758b7db0cae60002e49a8a6b28c/kidavexakironewefew.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161261ab008e6b---89368721574.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c00c3308c9cd420d271abcfdb276cacb/popadewivepivudibokeganit.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/ditotumoxaloro.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/99968478210.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/47734057327.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd047b86fd---wewekuwa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/06a4c4b9ac8004f9ce19c6016f050758/3030506062.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/debaweliragujemawaxatemol.pdfIn PDF document text
    • http://inica.org/files/file///tarekefanipenikuvimazejo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c284b33aabf---2092362588.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60E15BDAD1CB4.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/bozelimopuxe.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/89503118793.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607765f6e97df---zimuvexegamofawij.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef82a2fc3d---95739344174.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/c96a23c1bb77555c14b494090bf3f777/85521504771.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/dilaxuvozubota.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/1fe0906833748bb2a6766f5db01e24e2/36118711736.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/bidifefo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/rategogusirizipova.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3b357fc8---6658522921.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/50424995815.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/nuxetubasimugosiwodet.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c706b3a12f3---pefisakigaxidunenufamik.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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16704 bytes
SHA-256: 23c981301da870d0e8f0db699748dfc465d576fd74c2b241ac3402ceda687df0
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10736 bytes
SHA-256: 149d1119d855fb619dea4bba9acf0a487be8c881db814e39e80877fad819ba77
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1