Malicious PDF — malware analysis report

Static analysis result for SHA-256 790096e60d8bc29f…

MALICIOUS

PDF

116.6 KB Created: 2021-06-29 10:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c7fd3482b81592e8ad7a5aa70fcb6280 SHA-1: 1d179101d9e0e84b75fc9c38f432c259e6074af9 SHA-256: 790096e60d8bc29fceb3fca91bc70fc5bc9a7f9e65820ef38ebf16fd2952b15f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c751decf67582c74f64b68a34f5951e9/2039575953.pdf In PDF document text
    • https://areicon.com/images/file/28290061618.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/82144007167.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/77883252041.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/47469007263.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3f8cd6ca56aca25f070316373f9bf4e3/nolapemuroxig.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/vazut.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/58380545256.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/tccs89k0d8fhtarcmua1nc4hpk/jenenom.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e24e35032361c630535f9d34d22807d3/jomupoxejodinixemikis.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/manovobulumebolojune.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ee5cab6afaf0bd8e5d29457cf89eb42f/zomozon.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/si78o975pqsppcbbmre1e1nd3m/xuxakegavelexemogo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/eaa32fa839d9199a1d6f861f92b75a17/supaveb.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100ec8060f---35277076319.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ls2nl1ighm686oceenb5u4ub7f/3743582078.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/44649298213.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/rawuladevosuki.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gefumubegefisewux.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d91a7615119bdbeecc9021b07f46678a/vokavenabalo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa259151d33---zijodinevowajas.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724804d0161---tatoxub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=national+self+exclusion+schemePDF 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_off00016457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C69 19352 bytes
SHA-256: babd6f8b659c29b76210c97925df77e4314a9416631a7e5e72836041af8a7ea2
font_02_sfnt_off0001aca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA3 10680 bytes
SHA-256: 83c8756371878649cf2d7b14ca880f1dfd033e9b75fb1768d1d7d4492cc4d619

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