Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb701324bea29e4e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 3e2496a7ffed6b93aa47f9e88fa38dec SHA-1: 83d66307ac9bb5dabb85341f646fdcf4d3e1a922 SHA-256: fb701324bea29e4e379d48d8e9194688144a5c344f6101ab13b15e345d48cd43
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baldonimarcostudio.eu/userfiles/files/60331112630.pdf In PDF document text
    • http://kibbkw.com/uploads/files/dozaxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887db38e95e---vuligobufededoseb.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/tivoxo.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///60897574324.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/1935641462.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76764542286.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bimak.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce2973f6---xusopulorowekirazotilif.pdfIn PDF document text
    • https://kapefashion.com/files/files/80637749897.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/mixakarivezagisamuleze.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/tugisop.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/63685719278.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/mukewajemefenurimariko.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1624c3e5ba8d8216c1f88cc0b0f527d3/gisov.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/92437019484.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tilotojirodijuxipubudibag.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/88330300419.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b2088d41---74356588925.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/16382735937.pdfIn PDF document text
    • http://mousike.it/img_ins/files/23573017395.pdfIn PDF document text
    • http://vladekoservis.ru/files/jaxuv.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/62810553035.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cbf9ab8e---viragulofutarikodel.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41b59c6a986746cbfe8692a2fc93acc4/51145265334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convertir+archivos+de+word+a+pdf+gratis+onlinePDF 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_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 17164 bytes
SHA-256: 5bc7b6b60d8fab697b074f500c2ddbc0d06caed7df4511c55fde738916e547f4
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 11084 bytes
SHA-256: f385a26b1ea9c5432bbd5da5fef15f981c92b6978b5d21db68e215c0456c5573

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