Malicious PDF — malware analysis report

Static analysis result for SHA-256 d422d20af393c780…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 00:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 346e8a270676be52ed993c863d8dad26 SHA-1: 878389ad7a96b9852b0ae5e1e9c8ad6cc9d72655 SHA-256: d422d20af393c780e8e2326768c3c7ea679ca2347c574c4b02169f7f051348e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=deer+hunter+mod+apk PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ce5c6eaf3---79023139795.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03ca02138---81336093756.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/88070259641.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/vesenibileriwukikubi.pdfIn PDF document text
    • http://mobiliteit.nu/files/27284894638.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/sidiv.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gidofimixerak.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/603c71fe50979e6333d33412dcf97d72/65800666518.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/90492338507.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/dapidugagotevumer.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/bodezofemix.pdfIn PDF document text
    • http://belovosushi.ru/files/zetewanekijunexewekisotix.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zixedoxejovonarunurekitop.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/17961172755.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b276032100---tesel.pdfIn PDF document text
    • http://candientuvibra.com/images/file/6471789680.pdfIn PDF document text
    • http://pileki.com/imgup/file/ralenefugokububumexizedos.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/jatejojipuxowapabigubex.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sr00dl9r7a3vfvia29f9dg079m/lulorazewoxopokukano.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/tazanerupujexuv.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/lidikoro.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/2063467832.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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 14976 bytes
SHA-256: 441506341164791328d5d99a04123c10588514cc84240f124221b123c6ef8587
font_02_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10544 bytes
SHA-256: 6550680e286a64428f1b02438fb161564a537a64a4cdcb79e5a93fa014fd38b6