Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffff4a5929823c9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 08:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: de7cfe1a778c0130f58f0edce7fac0f9 SHA-1: ae35eebe2e0d43e694305f23bde61a62b869bc91 SHA-256: dffff4a5929823c932944839b5ec88183e4f6d85a579f2d966a605354c88ee18
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6d34afdfd---rowanuxedupebiwi.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/97734449795.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/41670440725.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210921_8B7F9E18792D508E.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/fituren.pdfIn PDF document text
    • https://km2804.com/ckupload/files/gunaroxopojuwimeg.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/48013977538.pdfIn PDF document text
    • http://gazetavk.ru/img/file/xumejuwabufinekuxu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/68108164758.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/xijufabejojavomovek.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c020f8e1ad---32299986451.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/52535685634.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/57371838474.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/tefoliporexexunodole.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/9276788978.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/13504961880.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/42864579447.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/62612833980.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614065d6c4414---48612264189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+a+phrase+in+grammarPDF 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_off0000b4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AC 10528 bytes
SHA-256: 3b7e4dc7b87543aafa444993cb14d403bd76efc9bd0ac007caec8f626c337a2a
font_01_sfnt_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 18036 bytes
SHA-256: 54535818830c3bc5410158b89fe5b3bda3fab191729c1c5493d385f7f04cd5ce
font_02_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1