Malicious PDF — malware analysis report

Static analysis result for SHA-256 89194d2457cdd603…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 23:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cd43ee5e027a1ae98c2bc3309b4cc8f7 SHA-1: 1ff31b9ff45a3688568ce23d0acea701b20abe2c SHA-256: 89194d2457cdd6038439945f0a49d9305814a7d8abfcffd8f7e2b87e953652f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160793b6a92163---zedoxel.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160944ded91bd9---80521441977.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089321f99fbf---puvoresonegijefogigo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/76161647043.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3b49db13981cca00b1fe50866e271eeb/83464164924.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b366aa28043ec71798b4a6f2840557d0/xinitewifaparabuwejelidam.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lagavofipitutifob.pdfIn PDF document text
    • http://cmtsport.com/pliki/40024859936.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af1c27420---bawujavevutememujafexejas.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sg7eh8r7ss1khvquadhevoa66c/daduxuxireja.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/30006754523.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/pokutozikut.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af0f173a3---gudepirazaxej.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/52927611682.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nelorojugun.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zexiwe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/valopajobuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50176947481.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9659364523---lizitopivemezufigabe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1e4bd2a8---rosigivemasoz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe1b74616b---85504043517.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2247d377---diniraza.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sumitoseboganarad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=different+types+of+conflict+in+literaturePDF 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://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_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10688 bytes
SHA-256: bea86b29e9fc71842e825bfdca836d1f0aa0e37f2ae0e9a0062e6a06d4f99e58
font_01_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: d631058d6196844bcabf0f117e013c5d230d08b0ce0e188179742ccb3362c84a

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