Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6e4c91eb6bba3e…

MALICIOUS

PDF

96.3 KB Created: 2021-09-01 12:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8c6e72ae4b109c297d250664e652b98 SHA-1: cad056e2b935daeeabee0956f6d3fcf1a9506a80 SHA-256: da6e4c91eb6bba3e8ac12085e417d0b6e65951cf99a4210877f12faffa38a1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nepalaviationmuseum.com/userfiles/files/31674993173.pdf In PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/46658028039.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/37498955195.pdfIn PDF document text
    • http://npas.ru/pic/file/32957698886.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xakejegipekibanamuvab.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/womexogeze.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/30366746202.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/81437657663.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/438492ae452ff9cf82ade795b77b911f/88442341931.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/11813768893.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4cd66344---balesotepanawowowolipu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cb2364a26---64887619490.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090614f8de73---nexol.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/silulaxilobuwaluwagite.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0de5836a4---11352329834.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/36842989075.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/db3tlaa4lhh8jaikci3rbt37on/fusewixorumeveniv.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/patexasasuv.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/834200.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607682be07963---kazulepuven.pdfIn PDF document text
    • https://anup.bo/images/files/95505704500.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pefotuwejosobakekaviviwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chart+js+pie+chart+examplePDF 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_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 10680 bytes
SHA-256: 8fd342341aa6c416ee49f26800677686e7428ba6cb0cc7cda65d33d618f4a878
font_01_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 18624 bytes
SHA-256: 64be68b6dc80cd49164758ce1cb2f29adf6d3ff04acfaebb3708d8e06da0f9b2
font_02_sfnt_off00015b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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