Malicious PDF — malware analysis report

Static analysis result for SHA-256 854676c947f7c42c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 00:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74bc22ae1077246947da82b1b9e95961 SHA-1: 920599b5de306d2e0f334f06b3da4809e0eb4773 SHA-256: 854676c947f7c42cf3bf90fe583a922c3ec2d9d7b83161ae6d3de90f80d471ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://challendor.com/fckeditor/upload/file/fobovaketokevugovoxinofu.pdf In PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7nmt1t3u3nuisg5t4qece2vaee/67187692306.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f20227970---4543187512.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/rivelifirudikarisud.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021081218062073499.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/24face5b67552a697d4c595d7f863110/noponuzoxuram.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/safif.pdfIn PDF document text
    • http://htwy.com/upload/file/rakimufo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0682a1a95a---kuxoravujufegiwa.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/devefiganu.pdfIn PDF document text
    • http://capri.lt/userfiles/files/76540054449.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4b4cb1b0---muwamajasudekepefuwo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-3/20210703132135288919.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1c19c48ac1580fbbf56892d92999206f/wekadoludaxuz.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/77008274149.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107140710454503.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/25653070009.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/83d2f3e3f22fafcbec9a18a246952505/tafowezuwukifu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf879ea22a---1512387866.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/879d45f59c22a4dbbd065d0067bec0e1/45446398137.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/73654048501.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a44e61e6e---76912860019.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b69013bf4e9caed437339db1fab5ef61/27546543329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jurisprudencia+pdf+definicionPDF 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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 10560 bytes
SHA-256: bc30fc5522516753b667268ea523c675998d332a2a06731c18f59387cf08d263
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 18236 bytes
SHA-256: f3da04a53fdb741c546a4f761aed69a24b63ecc9da68dcdd6e37f69467db88b9
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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