Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff8b9d87ef9fec4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 13:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 283109e460544646d74c91ac03f8f407 SHA-1: b888693541b182967dedc3a35f959abe9fc1c3e3 SHA-256: bff8b9d87ef9fec488f31d952cbceac36549fc097d44e6bf08bb5ab3e9815f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the 'super-forms' plugin, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ce9f3485a34d6d9bc729f2578603b992/pozijonabugukovawuwo.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/woximo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/busoweteren.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0017c2bf349d05875b85a13ee05ad4d4/34100659485.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6b8a0ea2---87617405204.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/xewodutafomi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qjmaq2s4kkebdudkivpdi7hs3l/60500683808.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/49289214737.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bogowumofavinibagivem.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a2520b35---39685584181.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/56381501149.pdfIn PDF document text
    • http://abnicum.ru/files/file/fijulugoju.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/79072364937.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/27680502679.pdfIn PDF document text
    • http://esistore.be/userfiles/file/65131504670.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/xiramevisokunujif.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/mamojaterojapazavikefin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad2d356ca141f399b111c4ce68a66ba7/bowuragaxelavagoriw.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/92028654866.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/09482c8b31903a026b90b6ed89c122a3/83876853714.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b378ff53e5c42aabe5bea579f8d68934/78390001586.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/4475584825.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c146a1904e---kejovidifalu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/lonefiwegeres.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dca+to+lax+one+wayPDF 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_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 10164 bytes
SHA-256: afbd4afbf5c37d5954c7d524f9d487d6cc96d16baa04706c6e6da38f8c95b66f
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 17460 bytes
SHA-256: b69872f4e64e7d6845c10dc44820aaebda31c3edb28abe5e468de3af5aedf7e6
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1