Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c47646bc3a3c03…

MALICIOUS

PDF

73.0 KB Created: 2021-07-28 10:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a3828d36598fb71abea7186b2258173 SHA-1: cecbc06f3eb734e2168ac1ae0e2d5852c07fd50c SHA-256: 65c47646bc3a3c0338fa14f92436e9a7861684487770c108ade75d5b67bb2590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or lure users with deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://skybuildinfraprojects.com/uploads/76682680071.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vq3uorn36rsvaf3rfesmj0lh3f/rowono.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d7786113---letavilakuvidaduvabu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fd91a045---safen.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a2809828---15525731018.pdfIn PDF document text
    • http://stillwaiting.org/userfiles/file/45212493266.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad95a8b3e---36600290440.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/surapinosidumedegez.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/liwomiji.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1de2abc72---foresuvusuv.pdfIn PDF document text
    • http://indel.sk/userfiles/file/damuvol.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fc5f00c92---68444325529.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/migikopit.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/misog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e03226182---mabiferosukuwoveb.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jgb88p4548r0abkstag8lo3fat/9128721489.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e997c8c6ce---wataragoneraginumufifil.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ec17612d84b36f183c5960b5db925700/boxonikegurebifiwufu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///76507980153.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81828280397.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/28fbd2e288649e616b38d78135bb0a6c/voxegalolo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/popot.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/73349696591.pdfIn PDF document text
    • http://kotolantopeni.cz/file/lowel.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc4e1f52a---dozigojuneworoso.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/93219920045.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fc110e668f194b22950630210b4c3ce4/50839978210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+redeem+code+google+play+for+freePDF 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_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 10788 bytes
SHA-256: 56de04441e6312a84e26d698a5ac8ab0c1cc25cc762dd1f4be139318a209fcd8
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 15592 bytes
SHA-256: aa9f0f9ea7a79afbf1a8470a9ae6ddd38d5b2d2a257a55b23de57cfaf7045fe1