Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baa3643d92340e3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 22:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb52c2810124bf586719bf0da2e8bacf SHA-1: 578e0ee0633bd9e37bcbf5f08d3382e5a5a0abbf SHA-256: 9baa3643d92340e3540210a18efc3bc91c274f74db21f417615d92095b61f305
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://baugeraeteverleih.de/benutzerdateien/jugijafovosemezuvo.pdf In PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5ad0366dc75981483e663f2c033fd0da/51151255233.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/61686729848.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/sopeveguzufamiluwufaga.pdfIn PDF document text
    • https://badrivishal.com/media/lugetekumafigiwegedufoloj.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/lovapuzuni.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/nakosube.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/nuzaxumubolupasufinegu.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/99756122528.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143812adcee3---18991694705.pdfIn PDF document text
    • http://ud2-140.com/files/tosexavew.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bba5b119d---74664405494.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/70554247567.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/zenisaratodekidapisononop.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96431243299.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/75820183190.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jajamab.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/sijukujebanapukudeg.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/47108306095.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5d5b0d98---57558030899.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/gilagaziveku.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/70022843150.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/tezig.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/vufizuwuwivejotuzerekegax.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/19518554967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=magical+mirai+2015PDF 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_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 10372 bytes
SHA-256: 0ba41c5160f281f8f52a30fd35185c4fe4c2b006215dbe81cbe711e2ccb0591d
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 20272 bytes
SHA-256: 4d28233be6e1153c4e3507cb2617bd4ccac250404d57871762d2d8e0c5152d11
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1