Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a0c40a2fea3f9e…

MALICIOUS

PDF

100.8 KB Created: 2021-09-05 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a1ba3e4776735bafc974fc3409781b69 SHA-1: 47a5124b53ff04f08e4a042e0086b4a4c0cf8186 SHA-256: a5a0c40a2fea3f9eefb239b088b580e02aa5360c92abdb600d879dc1d0b33be2
172 Risk Score

Malware Insights

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

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shiinamotors.com/js/upload/files/fasipaloledagex.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/50826163028.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d27c02556---jajuxeduvovudujod.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2490e2c16---59964017548.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/setazakevaloduxurefe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uftuuccd1c68vr2n5tlv4vqb60/vorelasokes.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/5bit59hjbt5jgf9ll648fkd526/81027996630.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/646ba345079c740bec42fa0e229ccf13/15429142142.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/3586088161.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edd0e57d4c6---muwezagubat.pdfIn PDF document text
    • http://etkenkalip.com/files/jupoxawaxexunobelewagof.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4iptq8j3d6mvhak9ugimoaenm5/xenupubogemej.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nakaritujedidirure.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/33934791612.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0dd984675---wusumopuso.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/82545838170.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nameresigiloxogemofij.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070159e4e8c2---sofusegewigijibuxipipu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nurexetig.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/76724776924.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160914911e973a---71512794717.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vpqs8e1g079hu9lbthmu4t1l34/rakagodetujexepililo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/vipapafepon.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e9376019486db2963fe57d009852207/gigezigufam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=alter+ego+a1+pdf+vkPDF 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_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10500 bytes
SHA-256: ce3a48efe0ddaa84213af6c37b7abb61920f88c441ca6bd220b021b758a8b4d7
font_01_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 20916 bytes
SHA-256: ed2ddfb2ba56f4bca775303f7f1513f3e78064d95c0a8dc1cf257427f0ba88dd
font_02_sfnt_off00016d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1