Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd8cbfe1bb0bc3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 09:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac49989372485fbd73bf08ae4549cc36 SHA-1: 56156817213eb3b198374981341b3d1219280a5f SHA-256: 90cd8cbfe1bb0bc3b9dd511d1bfda179d1f88ec5b4d0e5657ada7557b2807cd7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://allytemp.ru/uplcv?utm_term=ordinal+logistic+regression+pdf PDF link annotation
    • http://nail-free.com/ckfinder/userfiles/files/55111055593.pdfIn PDF document text
    • http://movediary.com/userfiles/file/potipiserolujiz.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/wefizikuwudikosomivujezan.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/91519864277.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57d5b86cd---pajazinileladodimize.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608203f48a64c---58176585547.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/niritedojumor.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/nekubet.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/57397506400.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5600413b0c793816db201ab419070bef/60877493212.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/fa93a9327f7534f795a6f31649335b3b/68246069647.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/27046112418.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/paxikaloxusavovimuge.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kuwolev.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/nodezeribagazafaf.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccd88ea3cfe4da248d30e8cad97e9804/38566003316.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/56728737978.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec9f065f7f---16846333418.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/51841407485.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/19557400529.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021072211433145.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/dafogut.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4f2babf4467110a82d0b9e55f9147f16/2691055573.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/rojerafux.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/88131103422.pdfIn PDF document text
    • 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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 19752 bytes
SHA-256: 77261a240d9dd6080639d9c6ab768d4141d73ba691c55e8551775bed2151698b
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 10820 bytes
SHA-256: 1dd6e209757f8cd8d809eb30778f79bdaa95c278a2d578daecfb0f954e22a2ea
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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