Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d007877e0ffdf32…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 18:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c64114208778c7bbec10699c2f7d71e9 SHA-1: 9a70f5dc49cdd782a0673c436835e1fdf7b1c1a2 SHA-256: 4d007877e0ffdf32e23b7c5e3eeea56c3fb076cea8c250ae092c5d945fab0a88
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and link farms on disposable hosting further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://studioagm.it/userfiles/files/98172528600.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2m2h3qi2g5kcpu0suqjeu5q5jm/tabigusedapet.pdfIn PDF document text
    • https://businesslife.com/content/file/3558288008.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b90c14ae83670ebacb47a6a735ba26a/18195149954.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/sutisolitapunib.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/kijumazulepufuwirebowelu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/55881256297.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48bc1da4c---38656943982.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609951dd92916---ludobunofejagesos.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pusufimowosoxakumububade.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nitazufipazomam.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/70f9b899278e180102b9bdc24c2dd840/rovusikusofijiz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829544569d5---11330892437.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/8174628539.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/kigaxexuwosif.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca22f73111---pajajobe.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/41617229995.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed64b62aa---daxidujebiduvol.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/72147202722.pdfIn PDF document text
    • http://feminella.ro/upload/fck/36195964098.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/13048606691.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/38819235710.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cb7c2e68c64d5183b459cc8f8aee712b/xesilo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/87b81b5bcaa56607cf5d106412d2f8fb/54420228431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=first+90+days+summary+pdfPDF 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_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10740 bytes
SHA-256: 6c923758f22f53feb75629747f7e1e085c2887f4da317b9007b4a87af1540381
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 18620 bytes
SHA-256: ec253355e33970714b008b1325332e2f2858e2be27657c28c0584f3ef8d891c7

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