Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b8ec3f66ca75a8…

MALICIOUS

PDF

116.7 KB Created: 2021-07-03 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93caef275b023fea05fbc9dddefdd4c5 SHA-1: 8a4d2d28fa255ede846cea51a82436456e84fb13 SHA-256: 38b8ec3f66ca75a83e84ff6ec5a2afcda3010b667a8780c5232d306f92f77a39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, specifically utilizing WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0d6f5ef7c0c9f4793ba6f57e2ba0c3cd/pilezofifopukasuvit.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9014b4e3---kerofo.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad761aa4---31467924420.pdf
    • http://www.chatanakonci.cz/userfiles/file/bitefoz.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1b48fa17196e47456b75f7518b181f9e/87479626156.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/enca0r2qc5tg41mcef659gs112/ginuwijisi.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c50e491253ca3da4bb6733072661244d/rejukebugoma.pdf
    • http://lab4050.com/upload/editor/file/rezetigenijeka.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5981675c81---tozezuxus.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b556ed8a356---3400068706.pdf
    • http://cosmickino.ru/sadm_files/85052870563.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c0bda1784bbd6d9cde3dee70cd0cb276/63102956767.pdf
    • https://kaptenhoki.net/contents//files/59075628000.pdf
    • http://jyjwqj.com/uploadfile/file///2021062101454278.pdf
    • https://burstallconrad.com/editor_files/file/75379838655.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553b5d92ee---gekupo.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e3ff776d40c1727954e5dc3be7f936a2/valepuxelu.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/82150746718.pdf
    • http://caratow.nl/userfiles/file/79394589187.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/kufuwasux.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608367e01bb19---lidorobogodakasod.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b9000a1d---boxutitoduxuketalufil.pdf
    • http://ecohost.ru/pics/images/file/tusozojezuzofixerosekiro.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071916d7feb7---16658224569.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=magic+conch+shell+will+i+ever+get+married
    • 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_off000165df.bin
2ffe34e297f33b2125d44ff0e36c1999b113b1a26be95ac0950f81406043f7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x165DF 17552 bytes
font_01_sfnt_off0001941c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1941C 16792 bytes
font_02_sfnt_off0001ac33.bin
bdbdb9a4d6e64359afe3cdf91bcbc2979c0eb46a13814fba162512a04981b366
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC33 10960 bytes