Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c79d38871dbaef6…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 23:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9b9ab55ac483173eb97e2a9e3711d363 SHA-1: ca26e779eee8fc9c3f09d4b6c0cba0dd31f968ea SHA-256: 9c79d38871dbaef6c24eb4f7e41bb49bbb7a73cfbf1693b426fd0df4608bbe16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://dansecyr.ca/pdf/file/mavupejitin.pdf In PDF document text
    • http://changdahk.com/upload/bifodejofevomekibipa.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160777b8e20987---41247866180.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tebudesel.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/aac57f74825233f3f9183f3e68dd06bf/marivixisejifu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7a0a1f72---jodugidibil.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210703_0D8FC18EE08958B5.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/xotenekiga.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc8596475---63398549292.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/23b3e5af6dcb9a3e4aa0a86bef60f7ae/93347000719.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/32a764025b7ebb6d09136b43a97d3afb/75410117690.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/164624339460a0dae41a79e.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bmeobhg73t4hdqm1j1j11ngvpl/vatobirajibik.pdfIn PDF document text
    • http://ligneus.hu/upload/file/75524924690.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2cfhoq196o17kvf1sgovrr5rf7/movujuso.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c468eef7ebf2dd35aa6930509f60e0e2/motasuvulepilojevipube.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/028d112938591ebf9cdf5e83a9a60c10/73022237754.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/vuxej.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/k953mc6ltjnif4ftmpkhf8atu1/25357260983.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lejosed.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ceca77f6---rawijodabewame.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/pemijamokolusawo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075969a0fdea---tifik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=icc+cricket+world+cup+2023PDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 18328 bytes
SHA-256: d29eb61fc5e8f9b7c23da886569ebd2f458d5a0a4a4f56846cfe561ec27403e2
font_01_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 10716 bytes
SHA-256: b50637d09b0939a8f662b80df21de3474965aab8fb9daf37a78669b52b1fd785
font_02_sfnt_off00012f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1