Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a187cc7d115082…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 13:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90ae14c5a64ae1c55140fc68485a8c8d SHA-1: 69949bf9c55c2616be1048146139143a47aa7c64 SHA-256: 96a187cc7d115082f36fae71b5fe05db725f1686fc6bd814558fb128a92dad3f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a fraudulent support number, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jinruily.com/UploadFile/file/20210902044701096.pdf In PDF document text
    • http://pillshop.ru/uimg/files/26337615315.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gatokev.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/detebulixusepaziteneje.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/zawijorinumewekazejufep.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jaliximuxe.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/3538609360.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/dulamux.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eedc1cda---20868629032.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/feped.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/4477612445.pdfIn PDF document text
    • http://yibetter.com/data/files/giwekubotuwosoduwimix.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/gefojusejosonobinub.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a8a6d715---72297363837.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/48152735989.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/86075922011.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/komit.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/41690428298.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613092e73a2e2---lomabezikaleteze.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dutogetokeritexagupafeso.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/79779625369.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/mevuzoxifilubu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161338bce3fe45---lonatujidukijagopagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+memindahkan+chat+whatsapp+dari+iphone+ke+android+gratisPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16928 bytes
SHA-256: c42017a376d3d7a6449a75373550664bd70f56caa40826f60f027be55c56d27a
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 11124 bytes
SHA-256: 0f48c75f3c38d3366184f8dde4c45e378cf3b431b9d7fcfa306afd12220b29e2
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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