Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18f3c2a4dd37e08…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 04:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 516bd29e4e18422d34bd1a5407adf4f1 SHA-1: fcbd6e6da33760aa786f654e861f467f192fc3a3 SHA-256: b18f3c2a4dd37e08ebd114bb52123ce2d6de512a86803d51635e7d421c743365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the nature of the URLs and the detection indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=5+minutes+to+kill+your+yourself PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b67374a9e---64438913549.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/rirebuwuwoxuxat.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/78981670104.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428d9ac65c6---fakalufiv.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613873e8e685f---31500596624.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/50817753666.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296390c5db---wuwen.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/94031758746.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wenebodogedigije.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/vusolok.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xabedir.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/dovomivavixi.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nujovabafefejitagot.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/10141131299.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/71453006255.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/75125069317.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/52657265718.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133413661809---wifavabovomipad.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/bugotawiva.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/10199178266.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/73740448527.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zapawasoxarok.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/62301865974.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/josncs7gs5cad4ciqg5rubcvqi/mugeveroxi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/riwavufog.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nidumukem.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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 18336 bytes
SHA-256: 87a4a8a86fc0f38e6709689dce7e9f93a1c3bbaad1f2b09a91bb9b1147ac7c43
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 10556 bytes
SHA-256: 5eec8cc2379db6102fb254325923958918412740561f4979fdec399d77cc0e1d

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