Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b11b4f40fc2d72…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 14:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3c804713faf2dfee7629008d061c11d SHA-1: 49345985475bebbb37b7350007e00f0d233e5081 SHA-256: c2b11b4f40fc2d72f051ddaa847b185cc898a743138140baa0839e3c9e8058dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nebo52.ru/uploads/files/vetejonafogimiku.pdf In PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/mojepuwuxegebifukazej.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c7e8d23d2535ff1fc2a2b54d50adb671/94737443859.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/funoretipapolawulazavipe.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/sumeruvuxikaguxe.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fegelotiwago.pdfIn PDF document text
    • https://tempegaring.com/contents//files/1298066134.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86280dfc6c---karutasejezurisewelof.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/47738895845.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vaxunigodebubopagififexo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160febf7672643---satigevuduxurulebijizok.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a34673025d---46328963091.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/vazatax.pdfIn PDF document text
    • http://ibb-online.ru/f/file/revupomopijeji.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/32342198285.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ce625aa2---vopamelamaf.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/mofonivozu.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bamid.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/84819087837.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a60ad3f57927ae408f5d256a89a9eee1/raxemuladajosofugavo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8008b87eef---sefixamirujoda.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/dopudadera.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/2390998053.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/cf4a5d6298a649c3c69a9942bbb55d89/90678772106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=antropologi+koentjaraningrat+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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 10708 bytes
SHA-256: 97a3ccd4eb6e111da3f274426a86809b6ffd39069ca470a28307180569f27c76
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 17620 bytes
SHA-256: c62b302e2ee40eace138a1b758ef35e94a53216a1408abf77ae16ce3921addb2
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1