Malicious PDF — malware analysis report

Static analysis result for SHA-256 c972795451cdeea4…

MALICIOUS

PDF

74.6 KB Created: 2021-07-08 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5308b87178c2828079375581c13e08c SHA-1: 0d3c38ff4cb1a3a2985f9376d973356ee966327d SHA-256: c972795451cdeea4705ec006e939632e149a0ee968f41359a68c38fbfe096749
156 Risk Score

Malware Insights

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

The PDF file 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. The file's structure and embedded links point towards a tactic of luring users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=principles+of+microeconomics+by+gregory+mankiw+6th+edition+pdf PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3t9fieh9jbkmif5kb6fmko48vp/lofusaxazuliboxixixobopa.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdfaee0437---ligaterobefojuxax.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sekoded.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061808114873499.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e339563a5---vekajixixiserobakow.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a913f2dc8f721ae086753d4e50491c9b/damorosipu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d66197b1e80---1367684518.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7335c165a3---60834525936.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/51090105806.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/65pvugtbl17rshd77rr6q6djla/zomofavewakavewokudu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nizopagupa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/99289742207.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/34406108007.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bb9829735c01d7844485dcbe726e6eb/92383757399.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/75560974848.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ccd6db12---71247981066.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/buwafojujubavunob.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/tejokasunujijopik.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/12468234584.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/03198accd23ef457fb9a0b0b3b4c52b9/ruber.pdfIn PDF document text
    • http://gabortech.com/admin/file/tixemonemixabegiduzire.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/5379293833.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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 11668 bytes
SHA-256: 5fb2cc7be6c9aadad9d294fc2a85696eb63f8b60462833188e0432a0509c5ce7
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16732 bytes
SHA-256: 3aaa1f4cc0f690a3dfc6ffbfd9021f5abdd5650822906770c313d89dfe170e68
font_02_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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