Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6272b4930f37182…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 05:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 003f4900c120176206daaeef6fce2e7b SHA-1: e35f26b58511fc0e8cf325fe4711344c27f97a86 SHA-256: f6272b4930f371827ba2d902a65f2b562554eb75f142e2079439ae87308f8455
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic point towards an exploitation for client execution, possibly involving JavaScript if the linked pages are malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.galiantsolutions.com/emailimages/file/93267272333.pdf In PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/81145290222.pdfIn PDF document text
    • https://rotitelor.com/contents//files/69154003464.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/vipofoxo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/19049692433.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/69463409003.pdfIn PDF document text
    • http://szpk.hu/_user/file/92325228762.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/zawedulolekimim.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01e2215dd---roratidopudurejizafene.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cce66957---83636487928.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608012f413980---xiwakoz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6437d640c6---9297864404.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210715_1E6F4F703C08A21F.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/41716556301.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2d721566---vojavirutiwakopuzijiduti.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/notovituguzazix.pdfIn PDF document text
    • https://signika.pl/Upload/file/73097922117.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210609092909.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/lepefuzijotore.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cad75cdb7a2---rejivagizizititazizi.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/64673935252.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086d678dc660---68892677594.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/sawexotopalip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reading+comprehension+passages+with+questions+and+answers+for+grade+2PDF 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_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 17900 bytes
SHA-256: 0d9fe6ed9edade2becbdb93987ec0c19cbfa7bd214422688eb165a6f002e5e05
font_01_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 11520 bytes
SHA-256: dec4685fd0ac42685b3e4ef3a1a019834064fd789aa2e109c6168fb4b3de98dc

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