Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c96bede7458b6ec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 02:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8dc537392c650280166108c9ca3cb51 SHA-1: ded2fbfa04f923d22f2bb9755523e9f0f6a977ce SHA-256: 7c96bede7458b6ec0faa59607b835d5898e9581ed867d917ee91522992e59c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://biemmecommerciale.eu/userfiles/files/81826888874.pdf In PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2d14d2a0---kewonekijizog.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kanikexejexodoxob.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sogobote.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16700504470.pdfIn PDF document text
    • http://aurora-c.jp/files/files/3415464186.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/16337979714.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/78295746739.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/882d54b21fb452709001d54032065315.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/48669007758.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/jezulexodagutamomida.pdfIn PDF document text
    • http://cichanski.com/Upload/file/33886863415.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef00356fc7---8024581129.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/motetefadejobarivak.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2c12d4ab1509fb9de59724c96d9747c8/gararuzivuzomanonaziki.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/xasoxesijok.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134adf9d8489---gebapuvibufobaku.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/rujojudoved.pdfIn PDF document text
    • https://akvaguru.hu/user/file/dulufemimokijim.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/vumazotavovetowuzijesiwut.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e95c12e938179df8ebb5859e90b9909a/43184310783.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/laxugan.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/wanije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+can+you+get+coins+in+pokemon+goPDF 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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 10956 bytes
SHA-256: 62cf9d2df57952a8256dbd953909cdbdd0a68d53514be9f7e7ea784880f434f3
font_02_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 14076 bytes
SHA-256: 1a2d1b6ce440246e10e01b4a2e956e0cf87836e54cfe135e125b1d23a51d612e