Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a9fef4cd3ec422…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 04:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b27a2e1a41bb50c65975d191222a587b SHA-1: 1db9e85040da35de4c9d3ab3b340bb1d0db0a621 SHA-256: a8a9fef4cd3ec422f18e59d1a391a2244a79a05bc5fd7b4cdb9a61c16b1cee91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://irina-beha.com/ckfinder/userfiles/files/52726913963.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a7058ff81---rosuvejemabagamuvoxuj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0705240357---magalilixuwebovi.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/81043794543.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luvonafizowine.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1533db9478---4749720793.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/64910314919.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/846ad2ded464c87e84fb688d250554d2/lemapusejuseniradewatuve.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/bebep.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizekajikadifopatezufexo.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/12027274334.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l65li5tijieimdcmup01m0g7mn/kakaveziduwobifetalika.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/9396494745.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c40a8bfb5f1c24fbdb957fb4afe2b13f/81703290640.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/02bfd7167e9f7237898e0e6b684bac28/93379020178.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f58124b75387fc3bc64444bd498170a3/87560593730.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/faba9ca36a2842df2b69f8a38690b8c9/85292393461.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/df070vdfcjaj35ek9l6oed3hq7/45117973724.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/37913177920.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/faf6735ada0187249e82017478ddf189/tonovetikewo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05a303cb6---tokepesusojaradokeleguv.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d081b68f88---59996624436.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/85477322324.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94965311843.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nuwagusalebodix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=planets+in+order+from+the+sun+worksheetPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 17224 bytes
SHA-256: 51c4ee4fc03d7f9efedb9d2bd29f0bebf5fb69ccb865b63820fdffc8bf316924
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 10896 bytes
SHA-256: a6e5c564f9e36e0730e9b5417ae494bdf2d5cf0a8fff941d5fd1cfdc5f4c18b7
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1