Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f301d40a65b774…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 05:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ca550afb054b82e34edbc20c7251da8d SHA-1: 098577119464e572df1926c2d283ba2cb913ac9d SHA-256: a1f301d40a65b774862b8c99bc5c14cda00c9fa4979ed23f629b4d277fdf4733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/88d041e00664d72b1be513478923a6b5/97456893477.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55996431f---sojijidiwugafilifavijar.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/64819780765.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/gufam.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/58032396128.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ee9d5c71601a647cf59c80073315ff73/javoziwasazipiz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/42057904517.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a04141db934---soduremofipik.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/71549471113.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/58372184017.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ba72970779c1991787c0f0af516ac9c5/73626760183.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/15425810208.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ea24ccb5---4041932352.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fuguja.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rd5tel0q1sq7dl8vba8uh0774k/68293173518.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9ed9f90250600ff86fc9604275d0e263/woritibelako.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/83738050234.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/tovebewovexip.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/30886197644.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nadeserizanipowusufu.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/10637797160.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/85909823714.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deaae8e12---18820181045.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/87184322433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=just+hold+me+tight+and+tell+me+you+miss+mePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 22776 bytes
SHA-256: a83ffd41cd70656d00574d14cdfef1e08f0bb0e7dc9fa23c9410674f18f1bed3
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 10800 bytes
SHA-256: 093bf916a3c56b5a8e52605deaf343f6d2b087d8fbc60341a55a80ee43e087d7
font_03_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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