Malicious PDF — malware analysis report

Static analysis result for SHA-256 9237ce5df8eae10d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 23:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ff4d3dd6b8f2fd638b720b823ce1fe1 SHA-1: 9dea5df7a77e260ac446475ec4c6532ddfd24499 SHA-256: 9237ce5df8eae10d2bc241c4f516efb8b5655285a5ebdaa39797ee3658c068a3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of numerous links and the nature of the hosting indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://democv.associasuite.com/imagenes/contenidos/files/wotofuxifilana.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb453dade8---vipeloxukituvexobebudar.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/tolewenudapego.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002e7d89ff---52833051298.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e450b302da1839f1ee0af6b1543f59ae/42818667776.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/85643255976.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lovodegojiz.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/dorukop.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/91681121106.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/38264695641.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cip5aqauk2qhki6tu3eppultp9/62612887204.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/90541327364.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6f4918c1c788e7d3e1a44e8bfe0479cc/4856388715.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/29216377733.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zajapekoralolusot.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d0f72c4f7a344a4f9bebb7c67872f9b0/zametikukavil.pdfIn PDF document text
    • http://mcutech.net/files/bibobato.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/romuja.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/40164242047.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/63489026972.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/pipisosonujonixime.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/nisarejiki.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8db0c274---xorasasusugori.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614947fd7de85---jujijidage.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/42471480553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+exploits+robloxPDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10196 bytes
SHA-256: a8c3c7bf1e7ed803a50ea54e04f90daf6a1d1f5fefe465bf2a45e36b6879dcde
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 17776 bytes
SHA-256: 39925dd056f3af197bc8b544f7911f2f40389330c5b41d8b69f7b463b57d9af9
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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