Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf74100189d6e46…

MALICIOUS

PDF

81.9 KB Created: 2021-06-26 16:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cbe9a659194cef5c25d5d6c4531715ed SHA-1: 57bef0d40ead41aeacddea146ba1636362a3f0dd SHA-256: 9cf74100189d6e467c5897e89e45fdc2fea6e257bf7f6b112f5d83add40440ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites and other domains, many of which are likely used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=my+wonderful+book+of+social+science+class+7+pdf+download PDF link annotation
    • https://kund-in.com/userfiles/file/26561645815.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5aa58bbc3---nakawadalesupema.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/79789207633.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0457f8252e---bobudadabego.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/9ivo6087l77mtllvvahmcb1170/vuzususigilamere.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/68121171519.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cface290214---kowowuwulikozorefeg.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jitasumeza.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5881b03dff2930de1d94fd3b7e337102/18043679935.pdfIn PDF document text
    • http://abnicum.com/files/file/tinokotururelowu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7b126433a39917880e058135e599a627/nuvujed.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b618ae85a75---65097290696.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e30d9abb4---tumider.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/60483a4c9d9a4304d882cd3c5571ae7a/lizarep.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d126f33db6---wokupa.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/3baacb59cc13869e57da7d565f41331b/mugurirupere.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/46bmpvoe8vdfr4hjuk055ce05f/zobetuwedojida.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430111410305719.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/45852107059.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mvjuoiv2dgkvbsoo523joo9tqf/bafawujazobofokugiporivi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afef11cbb1---gavubifiru.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c4da766889edfec71b30d939c7f82427/gevaxoxuri.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/877feda7789715ae74382ffca7be0b4a/kanemuguno.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/85296321705.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0bf559672cd82cdfefef2053d173200c/temubizakedatemo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffb9cc8a2---31192288818.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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 17140 bytes
SHA-256: fe4844d464e5e489ed37c077d3f0cdf20c639b92ed3a8ac40539938677da3472
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 11088 bytes
SHA-256: 7c049bbc5b3554dc3dc6a8987356cd8f3a3a5efea7c9c40eb179f1b7f98e3465