Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6bf03b1e047dbe…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 07:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3bec2b7b1cf8e59b0b02e793f4be7d15 SHA-1: f5f54d9047adc9bd8da084a22473d733b8a43c4d SHA-256: 7e6bf03b1e047dbec42dfeaf0c6bff275598006ba6815d9b15f51c7e44a42f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=100+ways+to+save+mother+earth PDF link annotation
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/zejezi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cfa38c6c4f1125fd1f0ada03f85542af/82026153425.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/57757401191.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cc9a26893a772693624763e1f63a3349/sejaberapuvabitusevuv.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4c17544c---fawokukuvefigobaxuma.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7d03bfb440e85fb6945af7e2e93c6e40/pikavegojolixil.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/31820977935.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/sipatu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/98453465612.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2c03ac28e41e180e122f16f3caa435fc/naxujabizefexasu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072daec267df---63006319003.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ca4b4dd4b54d4c71a088a7081651bec6/34467712208.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/gexaletufexomatoraxir.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m5vs0g397v0au02ue183ponhno/78103682697.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857e1b175a---99031982598.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xexorola.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e7328a172083600ab783bb108a15a73e/foxikuwajirojonuwerexu.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/madakewovepeforemukesa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609015280fce6---malusexaronogis.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/tekidotuxagewikalu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021642355434073.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160719e3b3cecd---gabeda.pdfIn PDF document text
    • http://email-database.info/userfiles/file/20174022444.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b87ea06f---14083436923.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/lalinas.pdfIn PDF document text
    • 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16848 bytes
SHA-256: e953db9e4fa8c1a33bb80274378fb32afb9470e9a1428cf52609ffa563a4dee9
font_01_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 10472 bytes
SHA-256: 88531e16a4c828df5a61eabe9e310becb99a14e4f885f9dc383a4748e5d3e5b1

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