Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67bae90ecd27c38…

MALICIOUS

PDF

80.9 KB Created: 2021-08-19 01:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd11fb48a7ab96f507e7f7be2f9d6ca4 SHA-1: fb68053179cbca7bea4272b2973191344318cdf4 SHA-256: d67bae90ecd27c38bc0a356af53442b4c3431880c4205674043e3489f2771550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm to direct users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=ejercicios+potencias+y+fracciones+2+eso+pdf PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160903fec6328d---4495459016.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bivubamutuwifixavamabe.pdfIn PDF document text
    • https://noventa.cz/media/files/file/16156673045.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7549e86448017de0ba942cba3f5241aa/bofikekosevolimudod.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/64206554665.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/talowax.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/gikedusef.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36073747801.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626122164.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h5rmjvrk20o1vofa365sv32720/30426631071.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/wusexomugeleb.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/bidozepafikoredas.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7c261eea---ruxaxezegaxatefax.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/84044525659.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/19041400491.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7f23ba041f5dd9aa97173113f9d949ef/87943758112.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874719728c1---xasozodazesutevusa.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/99703894423.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/54071507897.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xisidagoz.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/lifuzitusu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9t7a8q0c0gosa5pq4se83hnuf4/kinegukividoxejapo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dexajizetu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432003a03f---delobomuxan.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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 18020 bytes
SHA-256: 9d4c2f7e32aa495ca511c1d93003bcbe93a22b2eed29d7fc7f3c7b5ecd9c22f0
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 10916 bytes
SHA-256: 76f7182a0cc799b578d2deb9bb0d7d95ef35a6ecf59db5c12b1fcbae1a255a1e
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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