Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c50bab320e66afe…

MALICIOUS

PDF

73.1 KB Created: 2021-07-03 01:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6d4df184c989ad5ff2ce2f8e78e7cd0 SHA-1: 2416ea7bf72cd1f832f9356e3d4cfb59b7b61ff6 SHA-256: 7c50bab320e66afe2f188230eb1ac3d15c1510862e35e71a12ff838e30aabe14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://apsco.ly/userfiles/files/fujuxogafijezipugodebi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbb05130c---zafajimuruzujadojofibu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/37ae773b1cdfa3e4fea733a367a9235b/29960245800.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608476c68c4fb---fuwizopuwaguk.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/327762f4002afdefbd5127b2e61f650d/57869731326.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jomadunejukid.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4db6274a4---wodogided.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a85a0e42---jojirogusigap.pdf
    • http://jevades.com/aircraft/fckimages/file/69914540372.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r5cpt38bfgurvh8tgmsih4q4t7/67825156719.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160902689b3922---bukonepudinumirewave.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a60847b7---21944675420.pdf
    • http://digifast.cz/userfiles/dubisowibamukixarox.pdf
    • http://albino-pitti.com/pub_img/file/nipiwirimuruxuz.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1228276b5cfc8b88451b5c780c7f3015/zawizut.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fs68asku3sq93e52kep7r30jb4/zizavuduv.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4bfb115d---rajuj.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/af96ed1df3150050c1057ea1c8bde507/safumifutogufisapokokix.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cab14938056cdbb476c34dbe385691da/gotujufisupuzaponese.pdf
    • http://schokobrunnen.com/idata/99916099068.pdf
    • https://kham.vn/userfiles/file/9440981243.pdf
    • http://sns-russia.ru/userfiles/file/wutapogosobelur.pdf
    • https://briljant-maleri.se/UserFiles/files/19539261170.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=things+to+make+and+sell
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee0.bin
4a76eb2eebce8c9b1d6bf506255bfd5cf501e5252fedd43331e85ff3fff5b937
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 10652 bytes
font_01_sfnt_off0000d6d8.bin
905d4139aec16009c6fda8fbc732771da8767bd51d1e17494fe0cf945dd52c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 15768 bytes
font_02_sfnt_off0000ff3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes