Malicious PDF — malware analysis report

Static analysis result for SHA-256 803723df63623d6f…

MALICIOUS

PDF

91.9 KB Created: 2021-09-14 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25c1972ccb715126ff0996b40cee9d97 SHA-1: fbe79e09546a910f6e97b79059dc7643fb700b92 SHA-256: 803723df63623d6f373a9bf288f7609684f450ce8b58c3a77e3f5eaa8209480b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while numerous, do not appear to directly host malicious content but rather redirect to other sites, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/45594717496.pdf In PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/nuvosilawenefutazapen.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/68096548527.pdfIn PDF document text
    • https://ewt.cz/res/file/28137933604.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jagofikawojizemonun.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/69256079249.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/96111409712.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/130704424.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nuzumonazidivulesogixuwi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/jamazujuzu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vixukuf.pdfIn PDF document text
    • http://ukrfirework.com/images/file/13208118279.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90527144390.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/7306922080.pdfIn PDF document text
    • http://fitviewer.com/files/file/98545074723.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/35836660280.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5f5cf6ae---22544488092.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/tivimipubovomebefevoji.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/54786793176.pdfIn PDF document text
    • http://roocenter.ru/upload/file/21020734048.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/32162816377.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ef0b1445468497ebea6069107dd5b9f/3736463240.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/relagozera.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/75809549903.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7788232ab608efed79d3c664ae86b590/5252493037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+phone+number+from+instagram+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 17620 bytes
SHA-256: 355d99e8c33ec4bd750eb2e8c8caad31e9123941379a30a014c7030842bdaf15
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14755 11280 bytes
SHA-256: eec4b01e0d16cf6a46334c794dbd16e1625d1d2e1cae85511c5f3be43a97426c