Malicious PDF — malware analysis report

Static analysis result for SHA-256 619034c26bdca217…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 19:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 11a8c25312cfc898b6a7eb2692a152f7 SHA-1: 79bac64824d12b0fdfb3abf39c67f5b4a77aa85e SHA-256: 619034c26bdca2172d19116b171e9d691004940e49b70881379861026d172cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183050a4a85---zojolewewupabubidu.pdf In PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f87bc752de3d2a7f4acf831d8d223de/fazax.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/66091890891.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/lezadowofugi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc49e5616---30080151952.pdfIn PDF document text
    • http://autovoda.ru/upload/files/53747072027.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdadd438e---48054988186.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sepororav.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161103b72db6ae---silotimusekupanolojudojux.pdfIn PDF document text
    • https://stopserv.ru/files/file/66638381540.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/buvulu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27600892685.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/37193888827.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///dakez.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/94438805402.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vemj9a18gtnc9j6r4681crosk2/xavawojijabegesofuwo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2a3a7253---linijimatej.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5b8fa69417885d209ff2cfe11486bfe8/62808825396.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0531abcd32---lorenemez.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4d94bc8b56251af95e0cd1b48901012e/pumogozopikanuxobe.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/gazitemujunovirofuk.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/42636362773.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce252110c---jarureripikulaxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fiat+grande+punto+2007+manual+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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 17916 bytes
SHA-256: 5d1304329519f5dc878b5459fb1e83e0ff7d555c55ebb74a32e932953a5fcf8d
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11044 bytes
SHA-256: 7376814893f906017d052c9c189361b921886974a87eee928d1fbf3e13003790
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1