Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1fa2d5bd6a07d4…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 01:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 749e67dab927a891a8d1ce5e70d11bfa SHA-1: 9670fd90719625e4000b994ed6606ee7f0f1fdb5 SHA-256: dc1fa2d5bd6a07d4d64415a3ee840856f1c21b8a5ffffecf0d2b955625c76ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV strongly indicate maliciousness, classifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of malicious payloads from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=square+root+of+6724+by+long+division+method PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2776483306---boramufabe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rha0o925s3qtars1s9tt78ep8m/powixarafixuzudapejap.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/vugolesamogilovaja.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/95415511129.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/82359789770.pdfIn PDF document text
    • http://pasted-radio.de/web/files/xotekajizufopim.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5d6891c9be7eadc6f0be177931c68e7e/3145249204.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804104416.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31b5aa90b---12796186967.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/kekujifuberaxaxatolofebo.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/95143105327.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/bulowotewuk.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/5571327124.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3909c02e4c---28963757016.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oe12ahicilc200pknp0p81pd3/35076146455.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/revevanop.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/togaberesawoxew.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/nonirogoxutowun.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/gufibitovejaxudov.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/2222679836.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e16f2385e---96399744006.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3hp7ke9ln85h9r3su99uscdjfq/89726431751.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/xepoki.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 11860 bytes
SHA-256: 672a711d773e9701f3f9ab382a2f3205db067ec063e501ecfaf994f95a7a31f5
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 23144 bytes
SHA-256: 0829e791f91b2ccf7d6bab40110242d84f4e5ed85be4d66449550b5201e271f3
font_02_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1