Malicious PDF — malware analysis report

Static analysis result for SHA-256 a646544866b35fde…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 12:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6046cce82a036585bc502fb9937afdd SHA-1: 57ac9071322ee9fa952cabe39374505e32ee6cb2 SHA-256: a646544866b35fde45182271dcfe0591ab63dd3f9f37bc37ba6bfe5a886bf49f
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's purpose is to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised WordPress sites, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161392f704eb53---62842919549.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021090612125528.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/87483033375.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161415ae7025f5---vaneregukuxiped.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/29388564898.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/kuvulibugi.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/zemuxolarato.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/jizovinomizikinoroluturiv.pdfIn PDF document text
    • https://andrejc.si/files/file/56854733032.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/pogofebazovejasujesabal.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zomopimik.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jetikufedufetekorobakefa.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/73254695345.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/silisiti.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/renaribetod.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/33424507307.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/semegu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/xukomosuwome.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/74409335066.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/68736833895.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210915204125.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kakeburevibubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+instagram+private+reelsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614534c908b6a---vugozileluzifijaxi.pdfIn PDF document text
    • 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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 10888 bytes
SHA-256: cefd79781b1b7bc687b9d8768b8bc61dc8fc1b65ddaeb43c2b7f05d2e8fa2508
font_02_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 18312 bytes
SHA-256: 46cc40d8dd2e72c304628c4b94523cdea23d7ae5ab5ebd7f632a7c6cd0cacce3

Open this report in the interactive analyzer, or submit your own file for analysis.