Malicious PDF — malware analysis report

Static analysis result for SHA-256 f122c890b707cb23…

MALICIOUS

PDF

114.6 KB Created: 2021-08-13 06:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8bf433ad82b910fcf6e1f0d967a44754 SHA-1: 7437f74ecf5e354133820694e4cfc14178a7bba4 SHA-256: f122c890b707cb230696ac7ae54b150f70ad85ac14f22641f95e8bfbf1c7a1c5
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 0.9838

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 https://chcial.ru/uplcv?utm_term=smooth+criminal+glee+cello+sheet+music PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3a3215813f6fe2a5cb218ec324fef5b7/laleverezigigopatobaki.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cb5e16e559cf29a9914d259c777981ec/rabaxinomixax.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vcf6a3ok9mnt0tq8gpp94tc5t0/80935708458.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/rurexololixuzu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/29701641454.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2209f43b99022fe4be5d6eee8bf0243d/6375671075.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/bemitufojemebogujepim.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/77830939835.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a8429964---91800701211.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nepan.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c237ba4f3b7---43196936445.pdfIn PDF document text
    • https://arerp.kr/data/file///pisanejilojozulonid.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/maputakizadukigogilem.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9e386506---7637428161.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c667146a---19363396531.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/puvesetagusaduzivevenozu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f27b2fd079d1aa19bc23526cde624ba4/93159754323.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/33373565539.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/su4ugvgjagbgfqpk72cg9pnk0v/60287638372.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/88121190921.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tq9h5pdn0tnipo9bn775kvopl9/89166744474.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/67442075181.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210709_044130.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/57878253319.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 12360 bytes
SHA-256: 5a44fa0121c6cf93f401849417be9f6e1f68d6f5da6ef9920f486a48bd712618
font_01_sfnt_off00015631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15631 10852 bytes
SHA-256: 5593502817e2946a24bfa53fd9bef60b7f95994be0766d328a4a1eea82865c26
font_02_sfnt_off00016f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001871e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1871E 20356 bytes
SHA-256: 72b37fe9cf794d54957f6d3d33ff0be9fe6962fdb18a3559a8b22cbde0a39a08

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