Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a99bb81ecdc73e7…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 17:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ff6b587684129638ca66dcbf9abd877 SHA-1: d86b9affcb05d68b738a0889262a42e6e84b115f SHA-256: 2a99bb81ecdc73e7b158c3d1fe30c2b8964aec8248cefa3e0e914e60f503d208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links indicate it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://irlanc.ru/uplcv?utm_term=puppy+growling+at+other+dogs PDF link annotation
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1b77b1c1870d1abc2d15a2ea2087bb5a/42230780166.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/digunirovuxezoko.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/pidoxenitanikomukoporaju.pdfIn PDF document text
    • https://network-italia.com/file/dexalebex.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161090e8d6771d---winogavibifajudugonon.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6acp8fq8mt6dgginopmku4n9vh/pazoviditibovukareli.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e5ccb9539---vezitapifuwe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b11570ba0b8---ziwiwodiwodoziwilixino.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/wigemunafozerimomiju.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79794604c---xuxepekum.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085515f532ed---gisugabo.pdfIn PDF document text
    • http://ndt-ultratech.com/files/69068975784.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/43598828615.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4535fa4bfa---29872559389.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec3be1bd97---pewagiguzid.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2ea1f1ad72071b43dcd03622ed300dcf/81504938008.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/71bb9f8690eee7f61062f361914c1a13/radelexigivanaxor.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/25764414286.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/popofivivitejorutuj.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/6810822901.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/61332060943.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/muparepukezizugewir.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/zesubividipedejotajoliz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e1e1a430---dalupabunaxiwekokilij.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/timivukitepodujozepe.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/midoribupegejot.pdfIn PDF document text
    • https://parkettworld.com/upload/files/88893926639.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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16980 bytes
SHA-256: eabfebb4550e37c5f5131d5bf65c86408b86b4550fbf0c6792bc0504de6339e2
font_02_sfnt_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 10972 bytes
SHA-256: efff52ad6ce1a2d79a69f52b80a8749c83bf9366a2685942712fbc206af9d7a6

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