Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef8d52767027a93…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 02:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53e565ed5ae3674684d7c81f32164f7c SHA-1: 795dcefd9069ef3968315fa51df9cdacc1239d1f SHA-256: cef8d52767027a932ec83ff969e91a42241c8cab87f3f825478d3fb136569c3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=grade+11+math+functions+pdf PDF link annotation
    • http://china-hold.com/UploadFile/file/20210607105124604.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210826150521164.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a89b0d82---vifobeperivapenif.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cjmp578i9jvm4u8mbh75t9338o/pixinubodulozunanodeverut.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5q45d2oeqaivotf14s5p4t2j17/3333294875.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/sirun.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/328295925d3f1b04d43a114f288e6568/nixofonawetogizabapu.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/91294922056.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/tejusamodapetitenes.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/20584337645.pdfIn PDF document text
    • http://badgerhillfarm.uk/69367403035.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/30020685835.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/34488018023.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d68e9a767---ridewijetefoxixeso.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pesavexinuxeguzu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16115216f53ef6---xusige.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bd07cc0a8ae98b633759b87454e53481/bepekotefoxivofivokanibex.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c625a20fc---bodum.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/rusolavulopafuwaxavuv.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210529064629_178448346.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9d012e98---93434678147.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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 11028 bytes
SHA-256: 56429274a1725bf42e92e44332729a122897a02a32c05b41730c3a68d78dd581
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 17256 bytes
SHA-256: 7fde0ee8d5639042ae6c50f52a4d39a9cea5f20599626a1eeaf40f15aedca856

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