Malicious PDF — malware analysis report

Static analysis result for SHA-256 9378e68cbea1fd9c…

MALICIOUS

PDF

73.4 KB Created: 2021-08-09 03:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d840e25689e35cc24e592332be35941 SHA-1: 9db3558f4d4057f66dce4f6dfa173c9c98a66b17 SHA-256: 9378e68cbea1fd9c9d2b76a2de8da7f64f56ea935401cfe3e3f302168ff8d0d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://solee56.com/ckfinder/userfiles/files/47554905645.pdf In PDF document text
    • http://harissarantis.com/userfiles/files/64195437811.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/40867891397.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pemifubanedokiweru.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/nuletetel.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/kobalo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b104dbbab---wefujikafosozisezebexe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/07f9afbc21798c79acd6eedf22daa1f4/53184012689.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f447acc60---17770473906.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66c376e05---xotuzovoku.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbff07286---zulinotalarokubefase.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/31ad07bddba7bf8b7e79487cba02a50a/68670927755.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12d7d2ddc---83971445344.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e8bd2080d430f053074a928dea8ae205/zuxurivamegesakuvalerubi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c1d5e1e---18622229323.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901a4129d15---95819443134.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087950a829b1---jagudukidipufezajesomutaw.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/mosagegupilinawuwuj.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6aee90e861b22e16702c2bd94a329bd1/jimulijafulekapomuxobit.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/98693027061.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f8138210---zumitovonibawa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9a28c9c1---14171820387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=exercicios+resolvidos+de+logica+de+programa%C3%A7%C3%A3o+no+visualgPDF link annotation
    • 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_off0000ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 16200 bytes
SHA-256: 36d816043f01b509098c6b1a52d3781b3a84bb916cc165a43b808ab729bb6dc7
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 11472 bytes
SHA-256: 57fd85d17e8623f49465bdb425ee5d6be84ff3aec773f1ec3d05ac67053f20b9
font_02_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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