Malicious PDF — malware analysis report

Static analysis result for SHA-256 13920d5dc7ec3a37…

MALICIOUS

PDF

74.5 KB Created: 2021-08-31 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 759b0a4d6c1f254b65eea0eb57427e43 SHA-1: 80f8bf50a3ce89881ca622e4a2087e31bf381839 SHA-256: 13920d5dc7ec3a37822190ed52a8dd7dca1a3dd8547c1c6db2b30ae04daea301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=lewis+carroll+through+the+looking+glass+pdf PDF link annotation
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161161f04d48e6---58802638916.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/33bb68faf6fc153a26d0a7488bc3ffdd/28977601186.pdfIn PDF document text
    • http://gardatrans.com/content/Files/11231978822.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/760d367144cc25897475a0960dd38ca8/fipufijoxajuwufefiz.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/67968235331.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d606f6e7---36462863771.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072109b22c7e---5015074096.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/36126380280.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fozepin.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/motaxunodevoz.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/166394d4a5a79a49b7e5326fdf74c3db/wetarebokosatirakekojote.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/tixaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375086715---29984441168.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161062de9e10de---bafafi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/46e89d2091c167d9630948b2a7117084/repusowinazet.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zilazojozadunuzid.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091029508827---xebaxaxukuzisudaleviti.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cd795ed8---72337428123.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mowoduxoxozilapefun.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c17a41dbf5182df16bae84e59bd55d09/26647130400.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/96954262247.pdfIn PDF document text
    • http://e-sportis.com/images/upload/20454744160.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/95870598970.pdfIn PDF document text
    • 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_off0000c15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 11132 bytes
SHA-256: 1728d237d3fa4875080bc6382fa161a99ac89176e96ffb696a1409a312192ad5
font_02_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 15980 bytes
SHA-256: 75ee4203cdbaa6150342b2b0be668df5c48d2fc75dbedbd06497478a463e3218

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