Malicious PDF — malware analysis report

Static analysis result for SHA-256 b706b054a5663691…

MALICIOUS

PDF

81.7 KB Created: 2021-07-03 23:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3c9e63fba4a5c48286aa1e9d5a5b3e5 SHA-1: a1a42cb7b437b5b774f70bb06934f895555e5c51 SHA-256: b706b054a56636910c32ae1c51c750aa107257f9010d031f2da607833649c2c5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which host further PDF documents. This pattern is commonly used to distribute phishing content or redirect users to exploit kits. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a697a5ef665---3223794908.pdf
    • http://brenno-tojestto.pl/userfiles/file/17020332315.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb022d7694---bawino.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ha71uceu2dfr4tcm52vtkjguk6/guzuboxena.pdf
    • http://aelma.com/sites/default/userfiles/file/23977958229.pdf
    • http://www.allatpatikapecs.hu/images/file/muzagu.pdf
    • http://asiavent.com/UserFiles/file///ditonusededulojigo.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/47286822707.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8f630f36941a8712b9f354741a2953eb/jinolakopanugigumibora.pdf
    • http://perles-del-beya.com/userfiles/file/27519007028.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8db817851---37641571159.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c0cb408d---84263806634.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92369f14c63748348bdf824495c46162/bijoxejeruzekenonepowi.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791741d7efd---wotejoxiwogoxofevepukezam.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v4ptg13it9pf63ju0sbguhojb8/74231553189.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/5760426006.pdf
    • http://sklepjola.pl/userfiles/file/65183535115.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb4dd9661---48029112554.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16229768547688.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1815ab7d---juvibiterurosumas.pdf
    • http://vinmexindia.com/uploads/19076265788.pdf
    • http://boxethai38.comupload/file/midakulugeguwir.pdf
    • http://ff-engineering.com/userfiles/files/tuvegopadigodojiw.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe58d2063a---mifavekiwevuworesolowe.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1276c2b5---fusawiberusozasamudewaso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=iroduku+the+world+in+colors+online
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fa.bin
454aea6d9f969a69c9e1b2db29abbb659d9d1912bdc895c6639b1fd02b2a18cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 10532 bytes
font_01_sfnt_off0000e8ed.bin
9b60d293e5e4f46ffbff2e11ea1fa62eebe344bb5750abd517e0d1990c57bd0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 2976 bytes
font_02_sfnt_off0000f548.bin
a4f0d55f7957ba29a9b1705702d5ecd0949e749cbafe5667b8832da94dcb6932
pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16732 bytes
font_03_sfnt_off00012097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes