Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44d244831e6a00…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 03:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57aaf57d73016179f7def0f7c9e197b8 SHA-1: eaa39e6709a437aa50154bbe7d1116213b4f01af SHA-256: 4a44d244831e6a00a43ae3a8d435484856adb3914b0be0ea66a82457aeab1370
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely intended to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://balajitutorial.com/admin/userfiles/file/wanoxasedibevuju.pdf In PDF document text
    • http://obraz-tlt.ru/userfiles/file/9314471924.pdfIn PDF document text
    • http://balalajka.nu/media/vopif.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/34661566f61372b43a5c53aeadf8fb5c/96576739855.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613004707e5e9---98277415871.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/botivifevuwananarogixonul.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/safasiruvaxotunipom.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71e4f16e---jojezixuwunowi.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/wesopujaditole.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/25760280350.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/wufatikuwu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb56f921d9---15054774036.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137896ea372d---lunesixepunetosarixi.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lakesapusateket.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/80321844229.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/12890193170.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb432fdaf---kuvefutakavelofolesatarug.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/rulevok.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/tinerapididadibalaxa.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nudipetudatajanom.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/16860634570.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/siweluxobesof.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/91424780318.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/wodefinuxavutedavaza.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6eb8ba47de076514bf4c959c87a61c96/dejitedozigosowibaruzunar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chemical+reactions+and+equations+worksheet+with+answers+pdfPDF 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_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 11340 bytes
SHA-256: 0312a29a2153f464f38313b20ab89811dbd0da167eae49a5bc5a0ff545da5916
font_02_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 15028 bytes
SHA-256: 42ea68fa241a1310f329a6961c933f045817a5c48db7c9112c17cce72dfe7ddb

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