Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6736de0e283c605…

MALICIOUS

PDF

91.2 KB Created: 2021-09-20 10:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3965936e9f335b5143ec13aabff75bd1 SHA-1: bbba849c645a21b6fab3a0f16bcfeb0b9f30a6a2 SHA-256: c6736de0e283c605e6be4fa7fcd79602256a48f4ec6de606b79a2a2cdea0e89e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to files on compromised websites. These links form a link farm, suggesting an attempt to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sampoernastrategic.com/uploads/image/files/50209115124.pdf In PDF document text
    • http://salespate.com/userfiles/file/sulel.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/degubalama.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd3448c47---tujifuzamagabagab.pdfIn PDF document text
    • http://rotang.net/userfiles/file/66835650589.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/99190159247.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c35107b20c35199075412d5508fb4594/zejiwelewogozinilepezimod.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kuwunaxamodi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/47382083821.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/84957591728.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/sedofilebe.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/2736342535.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134fce7424a4---99364620724.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tomuqqe2qrihao2dibgop4qqge/dofoso.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/denakudonibu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93393254673.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/33594678178.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/34342187937.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/jurerixofurubemivo.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/37450253592.pdfIn PDF document text
    • https://kawanmto.info/contents/files/nekadata.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/559252305613206ca8162c.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_235129.pdfIn PDF document text
    • http://airmon.hu/images/files/likifunola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+wonder+woman+2017+online+freePDF 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_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 19404 bytes
SHA-256: 04dff1fe76e5de9dcf7cf8a011f0f62b33d2d949e3d0dd211bf6d6944f35bb9d
font_02_sfnt_off0001453a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453A 10996 bytes
SHA-256: 239f3a56542d7453bded8a89bc7eab3bca5312a936167043e982fc9e29f1fe3b