Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdb5af652025a63…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 09:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 551b716ab24dc24fd4dd0a5cb25acf04 SHA-1: 705214fa8b4f71fc5b5e2f1a48d3c0a0c3eae33e SHA-256: cbdb5af652025a63427341ebf9f7cf36ab0c7b2398f7973ce1b5f60c3d7d1f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hoteldazegliotorino.com/userfiles/files/joguloburuvuzukijabagires.pdf In PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/82495966360fdb9f2f27b2.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/834aqm0a6tg5jjd77noees83gf/90913414727.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/28148651908.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/96e4740gjsqumjnndnan3ee2t6/jobuzobaf.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vlrh6s3fs2g3jk7lq1nc3qjm61/76640915371.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/27751248577.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/20343934476.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/40381011498.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/59514731843.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609889db136a9---zuzegetigixidometiv.pdfIn PDF document text
    • http://haki.vn/uploads/files/67830623984.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lolodivobixitefef.pdfIn PDF document text
    • http://eko-uklid.com/files/file/74550981196.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9d4aa5fb87e7befad60c419e1519fc32/wowet.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3600a679a83eb724e5a5cbb66d75c9fa/5273293684.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/47470450796.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/73512280519.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/47728615696.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/49184240775.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/27922010588.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/turul.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jirageboxogudilar.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded59daf50---74624570308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=achieve+your+goals+meaningPDF 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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 16568 bytes
SHA-256: 522a118fd721c06ac3bd49b09c0da60b9df634f202c55dd96d4d1bfc81dd928d
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10840 bytes
SHA-256: 5cfa7e7c40099539f9e2886b1e70f21e24df4d554cca680409d2c655dc6fe8db
font_02_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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