Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf12263abaae957…

MALICIOUS

PDF

86.0 KB Created: 2021-07-19 19:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a6f20e20167c76e16b722d3ef7bc2ff9 SHA-1: 6b7a4ab794364f1c527aec1faf25b46fccb775f7 SHA-256: cbf12263abaae957e4ff7d54c4bd281092d47c81850a75f1929ebd4606f2e7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tutaylamhet.com/storage/ckfinder/files/50198693967.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s0q7eo4dil45gukl1gcfi798a4/jogivomazufilepag.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3823399b8---kodupetivopigabopatomux.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/roritijuremisotufavu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/bijovujivolidegewid.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160844f94390af---tiwumewobetufa.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/62281441081.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/gemeduwisodazijawo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdb8a2358---22203933195.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c4de5beb---52611092528.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e1b68f90---subawul.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e1e492948ea126d4ccc05c9ef355e4d0/68407449002.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d004ac99---vugiwibuxaredotatelor.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kowebimanupuk.pdfIn PDF document text
    • http://renknh.com/ckupload/files/39027434163.pdfIn PDF document text
    • https://tmtteks.com/files/84828067305.pdfIn PDF document text
    • http://kfbi.ru/content/file/xarol.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/10675076790.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210719114332_wgsxjl.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/32433161079.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lusl8ba52u7f8nudd1rvm9nib1/jarixebukituxugemonumol.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c53da6aca---legodaje.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/polexemotoxiwet.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f94030da---toguju.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e2a3f3cdf4480daf9c01f701c9449e5f/9532155586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=literary+elements+in+the+tell+tale+heartPDF 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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16792 bytes
SHA-256: a510de41d79a866a021304ce4feff05927be00aa275e34df7f53e6e9195e13b2
font_01_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 10324 bytes
SHA-256: 56a44337bc2aa4dd1740ebf386234f1711ca09d9888fafdc7c8797194e969d6b