Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdddeb973abbfd19…

MALICIOUS

PDF

116.7 KB Created: 2021-07-29 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 65bcc467682f3872048754217f4d9f6f SHA-1: 326dc9aecfdfe5f48f668ea0494bb53fed6bb5e2 SHA-256: fdddeb973abbfd193ed409cdcbd48f3cc377cba87569e8b281179ced18a5196e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7f1agnvlut6fajqgc8mol1bra3/xirugugegupej.pdf In PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/34489887138.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/xewukaxe.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/45443847528.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/46605897495.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5561edf1a898ae1eca98133d0f2b920e/dojozaruk.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/46200643107.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fenalatelanuwarixoxupus.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607755649cc44---zebofamilebage.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/10810472754.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zepebelinixore.pdfIn PDF document text
    • http://cjatkinson.com/userimages/depuzadegumiruboxegelu.pdfIn PDF document text
    • https://anfauglir.com/images/file/95365941961.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • https://landbar.com/upload/files/23418508798.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/47508635655.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0838195469ca839fbccd0ec939961f16/64569819623.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7cfe0078b072f42ce4f8a25879f901e9/2127220423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=skam+france+season+5+episode+1+english+subtitlesPDF 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_off00015fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA8 20104 bytes
SHA-256: 4cf7700a91dbbad584694bb91a9ccdefcd4d127f18a1e690d31d0eecba2fb122
font_01_sfnt_off0001910b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1910B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A922 11660 bytes
SHA-256: 86318b88c58df307a64c130793e06b25180739e0afc3e868f73f2a5149d9e107