Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f0bc71f7111f7c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 01:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd5f408702d39aac1d0d219c3deebebc SHA-1: 33a485bedbe003bf60d43b429945f6b51d3d0355 SHA-256: 68f0bc71f7111f7c71f3e05aaf922d75f1395de6c64fdc26c7943e2f869139eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/je3jm5khcqu8fk0qeh404cmfs2/lozotux.pdf In PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/86142399618.pdfIn PDF document text
    • https://seikai.jp/free_images/files/38641964326.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/tuwenexok.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63ec799354---zosesevijasoxowo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jc2rdfoc5jupijvbbb2f5psucb/39110246820.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xenogonurek.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/ea5027e7cfe7e0e3dca6a651ac99db2a/ponoguvuzudire.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76f1de1ab---64865561772.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b1bcd19e---28715815077.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf355a3bfb---tufejubufop.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/mimuzejegenuwut.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/62093494363.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wawof.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/nilebazujujevijad.pdfIn PDF document text
    • http://runhouchem.com/upload/files/37460277598.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105130828.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/27a5d1f1e2863266d9f50a12d9cdbeec/sisorenatutegoxe.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/bojinuded.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/96814495200.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/mobinaxegefunusetozemu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875303abaf---89705546903.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/38848141103.pdfIn PDF document text
    • http://www.ecole-de-la-In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=plan+comptable+bancaire+fran%C3%A7ais+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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 19428 bytes
SHA-256: fa95c9dd2806e29189965a5020da26bd06c17a0d18568cd843d1e966e14cbd2b
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 11120 bytes
SHA-256: 67b19236bd3262ac028cf4827b20ef55e993a9e8f742d97c4628657c51e2293e