Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f23b1e5f4d5b2bb…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 18:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1934363e358ba5f24b563e75b74ccd2 SHA-1: bd7c34687f14e6508108e3cee068415423377053 SHA-256: 8f23b1e5f4d5b2bbd2b3a1ebf7fa7c5ffbfd5ff04fc3e7a2f7b7842c31e92f8b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=food+that+has+high+uric+acid PDF link annotation
    • https://journeywithmypet.com/ckfinder/userfiles/files/mulewolanolosizokor.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nizazakedovezujekekuzuja.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ieukjsqdt9gv4orpcsvvvd7h1/jirujijodatinidabonep.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefe5a2e6c---88562568831.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/bawabamipodugafezu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/61417354102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8a4288d5---46691098004.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/71870337702.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5b16244d---nofomunavafeved.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kerofewuwud.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nukepozugakejipuviligulib.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fed9471797e9b29a9d90a2ad1b18cbd4/77418430654.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4d8995e39312e4b3b1b6c0456bab7cae/rosop.pdfIn PDF document text
    • https://led7.ru/file/xopikujopefuxuf.pdfIn PDF document text
    • http://schokozentrale.de/idata/86914002233.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/58a806c0b8c10bd2d25bda3ab3936a1e/notalojepuzanejadipizeso.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r95dsnpk2n6df6uk4k5vkn2v4f/99598759524.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021521057357836.pdfIn PDF document text
    • http://stasta.com/userfiles/file/kiputidulugifo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160708a7646077---wuzoxak.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ad29804d21239ed9000f0492807c3377/tigofalibavul.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/eo3iudbdt7pdudukhcetq9e5m2/39685867760.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcb260bf6---bugokumimug.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10444 bytes
SHA-256: 970256cd7852df8e6b1063f9d813df2dbf2f8754ea025071c32ffe8262edc805
font_02_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16436 bytes
SHA-256: 4c4653e243089edb66e6cfff5f6c3c8eee5f70b87e0514e0deee5ea2caa36ed9

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