Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cbcb7575ba2b03…

MALICIOUS

PDF

85.9 KB Created: 2021-07-24 19:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a2f30c44bbb8e57febc98d9f1bb20a26 SHA-1: b339836f59334ab42bb3c29166813124f936d7ce SHA-256: c6cbcb7575ba2b0325c7921285091c388b1ec5293aa455de81d1f138cffc5038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised or disposable hosting. The embedded URLs, such as http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddac86254cb04a160ec6649d64e3cdd2/80394636281.pdf, suggest an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://orangerun.re/photo/files/8030119668.pdf In PDF document text
    • http://camwater.org/media/files/vubusisaratimi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pewuludubasidusepal.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78279085667.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/funikuzamiwaxusefa.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/durosigakiruzegavegovux.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/visudejegiropusosixize.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/063no1vq5ssl3af52v3r41qa4s/29989008206.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/fojowaxojijiku.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c913377d2ceeac3041b1def00e5d8b06/76990185198.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080403ba28c6---fafedulebirazivupene.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jetobuluvodixoje.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09a13adb9f.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/68508334324.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/weluxipamuturutito.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/gutilobanol.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/5775693872.pdfIn PDF document text
    • http://tai-group.com/upload/files/kaxogiga.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/29845254347.pdfIn PDF document text
    • http://kaies.cn/upfiles/2105270628284274742zjtbv.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hpu7es7cpbgpvegeb67d5n0lj9/ketuwudijitozevumonudi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddac86254cb04a160ec6649d64e3cdd2/80394636281.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bbc9a318---42635150156.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/guvaxixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+save+e+way+bill+in+pdf+formatPDF 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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 17736 bytes
SHA-256: 7d8a71a8500d75f4fc9cf1c81ef80d44c0f57948f26bb174e51904190b471874
font_01_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 11056 bytes
SHA-256: 0f36de320e3f0c3d9888181c8a8fea8a3d43eb2fa45ace3f5e7a4db05c606a3b
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1