Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0de1a4f791c74f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 05:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c15112ab1ed7c35ab23cb04f4e74eb9c SHA-1: 61e92deef10dbd30bc8f9900513d9e8129e8d236 SHA-256: 3e0de1a4f791c74fdd5e9161f9960aec8b6c67778760eba7db62125288a6a00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a practice test.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=true+false+not+given+practice+test+pdf+with+answers PDF link annotation
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/fuvafewutagano.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e0e5d6814a71c064527e96b7a0e517ab/manikefefumisajojin.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/18f5e8511813bb9b54da3cfe35fa5098/nowakarebebaguduted.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/aa1580f96fd43d3e3d57d33812cc53b2/jesugobevavubelenaveja.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/majegisoxapokupazabibeg.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/57559606161.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m27s1j4m0th5jk5o016g921eff/83393442268.pdfIn PDF document text
    • https://rentcar888.com/uploads//files/202108120046531406.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/difatevimivejopepa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nv2kp1hdmu4jtbrdoigh5na852/tisam.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/41b277a5775a97d6e2ad3e5af46eb975/titodemebodamelemovo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/73368374277.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608917ab0f493---63218980544.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zusagugutizafuzalekonunaw.pdfIn PDF document text
    • http://bjjiffy.com/upload/zepatuw.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eudtlralfo7uq4s01eu2svo335/14488395168.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/51338870478.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c6904d7199e73f6d505ab5abdfa992e3/wajiw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62b92b3ac---disovixomaditipetuni.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2911b77e85---99106452190.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/90066393830.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k890pjsjnrmt55ug23ef04v4u6/90835645095.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a11d0cc591fb4a33fdf23d1b7adb0813/wexojomadesujamegikugex.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/275e5bde3d64894b6b65eedc7beb5067/vanejexis.pdfIn PDF document text
    • https://area5srl.it/file/sivodebodizedubidulexap.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc6b32f54---75268857977.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/vedimavupidob.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_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 11112 bytes
SHA-256: 0f50f9fdae3c1e523e09bbdda9f712c20bddc0b500f06bf1114488ff9433ea1b
font_02_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 17828 bytes
SHA-256: d978bb9202862af8b5875460a95231e6d4516b0ed01e9ca273ad12a55b988f56

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