Malicious PDF — malware analysis report

Static analysis result for SHA-256 80274d79d5af8ff4…

MALICIOUS

PDF

78.9 KB Created: 2021-08-12 16:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ce772bc414b7554af34843f2d70cea1 SHA-1: 90955872249fcff7b6ab29c425dc4d95bfc74004 SHA-256: 80274d79d5af8ff46818009f4b1e40167d0cacb7efb34220cd4d2057307b9433
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites and PDF files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://imcborivali.org/userfiles/file/lozozura.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/7238818236.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/3470540774.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/96946886162.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14304422220.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1610a20a156545---jixoxerununasadilijozin.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160852dcb17724---93476525545.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5d4a88c5db68b7821046cc2db6948b01/vupetawi.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/62528632880.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/vuzodalugefuzefijunusobu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/147637236.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rjnv987ndpsd7mgjclrfahn950/zopukeperesisomuw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c31bc921981ec7af35ac1c595cc6d73c/32583577430.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/votewofuke.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/venominekeporuxi.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/66191736409.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6c9f9dbb073a3702710e12d15618f2eb/33727091716.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3d85d2cb431f64c8b57f7e8ca8c777db/sudivitigerutoz.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/vovazafunixawimive.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0kbe2sbjdm98qa39k68ii46bb6/dunaf.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zaruxotej1620811963.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ddb62253---68804891450.pdfIn PDF document text
    • https://angkagenap.com/contents//files/98377727780.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vujiberejititarosarete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wheel+of+theodorus+project+worksheet+answersPDF 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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 11028 bytes
SHA-256: c29e0c2aac6145831b3ec6f84110fbb0e7c8ca9b4c071a069c924446cfc5974c
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 17260 bytes
SHA-256: 0964d704c47a85bf0ad96800f03a804041819f9ee188a0a0f416a50de66a8bd5

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