Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb639d37e40c8750…

MALICIOUS

PDF

195.3 KB Created: 2021-07-21 09:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b73090f4966d0472324af54c68e2e27 SHA-1: a176ff6956581977d75b35b706eee621bd433ecd SHA-256: cb639d37e40c8750cfb8e2be9d37bba9d2a02a6e704086492995933d6490ff8d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to compromised WordPress upload directories, suggesting it is part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or malware. No scripts were extracted, but the presence of numerous malicious URLs points to a phishing or download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://stellamaris.cz/userfiles/6583936407.pdf In PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c091e34dee8db14c5cd033e5ce9eb2fa/63934272917.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/050efdfc456f803a33c472f41ccf2728/sotujezisemoxukesawaluso.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e25d2237---92356677952.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/29517e91a43693cefe418cff2714e81e/66124216551.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/gixawexukelijapesozife.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/9815155740.pdfIn PDF document text
    • http://salt17.com/userfiles/files/15753894953.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b952f57dec9---78379159398.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/73497120871.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/1068188322.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609907eccb28c---76031042596.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f13fde625fba2b14093969fd10689221/povopogemapizifizojer.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/68109390080.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b9ef2076219443ceb49c2d5a5030e904/9130549373.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/699ce4f30c95c9237df4dfc398472a9d/38520029536.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59b5300d---moted.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2ueioojlteki9294vlfs9u410r/99753890670.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/25009970990.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7709e0eead---9674075666.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b88cda91feca36f50a977618528bcab8/puvadofed.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/27030498769.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55d8b8df2---wajisiziwijob.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ceeb46dd5---613233848.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5ddc164d---tozegapajibesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=manny+pacquiao+mansionPDF 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_off00029f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B73E 19032 bytes
SHA-256: 53f3a1e277880ee13e355e81262fc07e4cf1db76a10bfa375c3788c33eeb1e01
font_02_sfnt_off0002e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8F1 10512 bytes
SHA-256: d1042aaf10025baecf3478137904db60e2c64bd19af837243d988326b261c15c