Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de91b3b1813f459…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 22:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e53e5595a44a53b306890a07ff297ad8 SHA-1: 5559c27e6b67ccb9c91ea68b4ab85ca55eb13268 SHA-256: 0de91b3b1813f4591f08255f4fd45ffb197f4f290a34d198f835367c3016ba34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to WordPress upload directories on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e825556a---miwuwupaleguwa.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7906498ab---vovabepumudize.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/nugixuxejukexa.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/megokejutubidux.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pdp517ofrglndut5o9bkis87km/32042559765.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/29901582275.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/13683308400.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/3598471604.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/totepikunagupate.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/xuzuxivus.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/5670180392.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jizab.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c015398d---11853775758.pdfIn PDF document text
    • http://aven.su/userfiles/file/27287756914.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/mewolivalosezenikudarufo.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/34671280654.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610abe778a202---devum.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/turejawumofuwi.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/46952713363.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75326ec44---75632257324.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/fabewilatoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=farm+animals+worksheet+for+kindergartenPDF 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_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 15532 bytes
SHA-256: 77fd0f6eb7379022f38b01afa7d06cbf577d208c549a1422522b1257470b0252
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10956 bytes
SHA-256: 6d5b8c313b5909fee658888180a4f0cafac5a89d850c713a7919eb0737e28bf1
font_02_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1