Malicious PDF — malware analysis report

Static analysis result for SHA-256 741120d6005f26b5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-07 14:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ded592c509159b9345ef7e609b48321b SHA-1: 037b2252cf2cd508f5be70257a3068e9e2560c50 SHA-256: 741120d6005f26b5d4faa60210926882dc2f8444401dc5998f4b26c900b676a3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6620

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=ed+and+lorraine+warren+werewolf+pdf PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49c772545---tagajivosudi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///96891015622.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/22464973616.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba1327d6e---44770183851.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef05d2b110---kisagabagekaribimidekuv.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8261448a6---sunixozeroz.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/guwuni.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/dunukanuleg.pdfIn PDF document text
    • http://fxmeat.com/upload/file/3b5c7673efcb666be903be346ce7589f.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/13190736003.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/27666614104.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2b24d52a605a0f3ede314cfb5c4734ce/levununogezuvekit.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/nepewidefurifu.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/64293690369.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/39922180774.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6e0e3bc6f38b06121ef1ed05a6fee921/66183345444.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160882996d2fb0---33452020628.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a4bae97---fumuvivodopopabap.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0k7qfkn3hlrl41fhk48c625n5/vofixizafizafeporadoreduz.pdfIn PDF document text
    • https://laps.pl/userfiles/file/53809890370.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/epock5peqqkovsangqeupcolsq/11837155508.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54003730555.pdfIn 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_off0000c1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F6 16400 bytes
SHA-256: 673331bf8b62889c78db7b5498966c3115fbfa252861eabd50d63c3eedcd58bb
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10296 bytes
SHA-256: 8bda9e782eb2c7dac9faf201238a4884127dd0547f0de0f71f36d28002f4cab8