Malicious PDF — malware analysis report

Static analysis result for SHA-256 716e64e4108939f1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 21:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9af24f23e980c5e207894f15b04b34b2 SHA-1: 19216119cffc90886e748ed3e438db87b9079e43 SHA-256: 716e64e4108939f1bbd19a8a603a0edfc8450ccd5e70caf6625268d9a2c7c5b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a user-interaction-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bartuceviri.com/userfiles/file/78453356107.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e4aa0b2f42ed155565be82770215dc0/gopisirijumumidevoju.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160df585cce7da---matasazurumugavi.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/vezemigedofavom.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/25047526071.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/71516454110.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/wujaseleviruvegojur.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tibole.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/57786500344.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/19275884898.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d12e54cff---joxup.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d66b8bce4---malamerus.pdfIn PDF document text
    • https://www.changhuapmo.org/plugin/ce1/ckfinder/userfiles/files/nugokewudorajemux.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/57059163907.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/82e7aa7bd166a167a756bb0836ac5d86/84715514586.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3bfda535---84690425539.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wemimaruwatokizavefebu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/liwemedabebelojofemoxebox.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ledokorimuwulogalikelel.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/14632769600.pdfIn PDF document text
    • http://leguido.net/files/1092434907.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160837a837d346---mibiwura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tangents+to+circles+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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10756 bytes
SHA-256: 4da0a3143799db6f6ffd371ada6b269fe7dff8dff9957aa080ef81707bbeed77
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16820 bytes
SHA-256: 715171f4f45729d3ef82b294e68178014df2cc5787a55cf40deb4063d4254886
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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