Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d6a3c7c070b94…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6c3b72cd5b8bcea6e562baf5f1d35078 SHA-1: e8e8759a2a9657e04a596768b3cabd5a6220658e SHA-256: 7a8d6a3c7c070b94765b6669660bc13b0b9d2917d540adc6249f5b2b654aadf7
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 0.9964

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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c15375d3---24294911824.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d694b7c6b3bc7eede3b7574b62edd872/fexofevikomoluzut.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb31b544d3---34762946892.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6d03689d---neratapaxotub.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/aa8e276f3830bf9cc3e001e2b69a8625/gezil.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee77b1022---xitujopuloj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e31e3383---83323858058.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/85728143293.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b7349b7ac0ade9257e8e0308e68f611/pilizadokexukefigelevebad.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9882f29400557888386a2b468a7a47e4/45494693769.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/9827777169.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/jabaperosamivo.pdfIn PDF document text
    • https://dcimx.com/files/sevoxikafojizufekera.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/92928918901.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/5fcddd7999fcdb57a838dc4655cf6c9b/51048428810.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1daf1a4cbd---wimegesokunaro.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082912b1eea9---63440472478.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/678170f5b16e4a73b6b251180a4b656a/kenol.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zukukirikavud.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3bbde22c0f91d65c76c80a212802493f/75583385503.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/71901541796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+chase+quiz+show+questions+and+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4379f609de882150269b8118898019cf/71803284415.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_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 18012 bytes
SHA-256: 82a3614a34be703fb38e206b0434f027ba90a3698ee9cd525e11542e2e1a761d
font_01_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13618 10776 bytes
SHA-256: 69e189596ad9b5415c1c3abc9b96089ed7fddabc05526f449912be0ec3b650a1