Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df79a62a69b5520…

MALICIOUS

PDF

97.0 KB Created: 2021-06-25 21:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e44124049380e209c8c294877d934856 SHA-1: 89199a85858875cdc86e7d86462419270825b427 SHA-256: 6df79a62a69b5520498d87c77ffce71f024c13881328dbe8295ed28d6cc08163
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8534998a---viwobonajodigajebixemabi.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xowadugamagubezonuza.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/69627534649.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc469fc0d---wadonuriju.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160782f1ff2ce7---sifegiluf.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d6086e68c06---43131187708.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a1a86665---63303624596.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/likijanalevibawure.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/zatevakir.pdfIn PDF document text
    • https://birotex.rs/images/files/59105646874.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/68943453117.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2339e002---70192950384.pdfIn PDF document text
    • http://tele-video.ru/upload/files/gasudajuxixabiruxuvowe.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/ruwupuxepipojumixukegok.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1666f0ab---palasedati.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/bbf536f32a90e8cbf524853a7f6b1dfd/32262120163.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab649c659---nevazobo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/38sv2nfsquoavji5srn848vcq0/48643741370.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lafisujuvufobalolewa.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/navajaxujafovavanufupod.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/55612627288.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c46d3d83d---xamojifizuje.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b83aad7b146---55698986721.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/abc02e762dcbaa502611f761c40bfbea/26015475516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=game+theory+prerequisitesPDF 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_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10768 bytes
SHA-256: 44901ce8b0e26c26266b91e0ddebf37eb9e0eb1b9cefdd301b79b71d9277cffa
font_01_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 18232 bytes
SHA-256: bd077fc4d3be87b02dc8e2ea9f699ab4f518ed830dec5af6135427f5a76f1ba0
font_02_sfnt_off00015ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1