Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b580523524ea8d4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 14:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67ba15f3067981aa204f2c2d830f5027 SHA-1: 3fd36f0760780306723ec309b147d3b4a60ea440 SHA-256: 3b580523524ea8d45eb7dc53c254f62bfea8dcfe0bf9d48312b49beb3f79c156
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=cgbse+10th+blueprint+2018+pdf+download PDF link annotation
    • https://amitadevnani.com/userfiles/file/4281885778.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/14dcfee5580848f0a73d13149ef13b46/49357389482.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/lixefaxabulujulitoleza.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/86319515317.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210708105717.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1ebf1226ff3b8c1733a2679b6ac8e5d3/joroxorarinofodug.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/46391d090cd2c346cf6dc3e4b87c8381/tojenojosuvilumere.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083faa0bb509---dumikowobilegadopuvejip.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zozitosamumu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jolunobidabedogukel.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210824_DB55AE93C7C49262.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802e90d84e---zovaxojebenejugewapo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dde3fe34eeb526945293459ff99ac688/19166626461.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/772fb414bdf81832ec78eefadd6e0040/56211607876.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78777617220.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/19481697226.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/rirujokisadufezananepeva.pdfIn PDF document text
    • https://digireg.pl/upload/vobagise.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a3889e4c---95906790361.pdfIn PDF document text
    • http://intergeored.com/upload/File/31237426785.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7qhqvnt5m3rms224pbv1ojohm/16899194604.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/40931302650.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/76739425054.pdfIn PDF document text
    • 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 11636 bytes
SHA-256: dfcece2e206668a1396cc7f3ba0961e511602d1c6013b12d0c451da84b615041
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 17328 bytes
SHA-256: a2d3c16718a31145800e294bf60dbb563d35265b67cca65831fda16226b0b8ea
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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