Malicious PDF — malware analysis report

Static analysis result for SHA-256 b066e6b85671031b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 10:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b301e370ac0b6fe3ed8f653d7f15eec SHA-1: d952590508debfe4678f7caed99ce6c284aff47c SHA-256: b066e6b85671031bed6d08e1627696ab2067b98ec27ec1f504c4584a7f07166d
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 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b811ee5b408---gipakotamivozilek.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/zukurotorifawugub.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d1be1a84---tulemeradowaxonubuve.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/51529273958.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/753f1dda2757265c9217217ddc02fe41/17411059570.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/05c3c212044d754df9efc423c02909d7/felotavafugogoravesenem.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/pewojatomelugunelopewe.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2mt2fsk1r2vnf51idtamdn8bv6/62797199093.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/918f411dd495b87d151b7404701cba9c/rutaziminejajuximod.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/dapebomogazenufovalak.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/doniximumijele.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/66634bc40cf4cdddd2c1b675ebc93957/vodalawebe.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92408323e---jitedilopibenivejalogebu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/navunovupurabijekujav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70a000dcb0---94354635644.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/47081174273.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/93315963680.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/jotularevaju.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/gitujilubewu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8d6cc56d19353ffcc00e732e5bf8e42c/92998159168.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/555a36351950a79914927d2df2096bb9/73123927672.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/utivjkocmpei5mi9tfep32fb53/30846109827.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/76625374693.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nolarotuxagowitam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meditation+gregory+hays+pdfPDF 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://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_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 10836 bytes
SHA-256: 9d76f6b0b93984f325a4b141e7cbf04c210d663552f6292e7d63d4dffd14b4ae
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16840 bytes
SHA-256: 7c34a3feb41e7017d9f94135f5cba95c9bdf70c75ecfe5f593a9651619538457
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1