Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56f70d222053633…

MALICIOUS

PDF

97.7 KB Created: 2021-07-25 23:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9062036839df8f8ee9702adf274b966d SHA-1: 42cd44c32908010ed6e97757745e9daea678c07b SHA-256: d56f70d22205363333e113ce992999657e214b8a04b853fddc831ee907a104ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. 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 analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mayurherbal.com/userfiles/file/dekowevefosazagezek.pdf In PDF document text
    • https://semangkabiji.com/contents//files/maraguzukexuwoziwadora.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tokusaleloxew.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/nonaligegomuzesujoj.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a717ce6e4---jiwafifomo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3cf3052749cfd475193dfefb36fc8526/rotimugejivosov.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n4u9t208iuusucv7eus64b8293/4560104349.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/45638551518.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc808f78af1---pubigosojediwokewemep.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e8ad87d0---bepufitukut.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88abb2f62---60884714247.pdfIn PDF document text
    • https://manenshop.com/upload/files/nurexa.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/42020795571.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/zazuvudirosotamuw.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/24723834225.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/fuzarububegevijabij.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b15a6ec68---zexazogibi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a823c63ffafbbdf433fe085f3f27e640/98956188322.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/wijikonakuxewomidokokiv.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/3635672713.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b28e97e7---zujawivo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc6ce1765---31499052381.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dj8jocgvi4ipfltcl1n4rp32c6/fusikurimadujagajafinebe.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/81969479928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=teor%C3%ADa+del+desarrollo+cognitivo+de+jean+piaget+resumenPDF 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_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 11176 bytes
SHA-256: 265685227981e1a1d1590c7d1e7c4e466b2656a73aea389318851c5da41cafd4
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 19028 bytes
SHA-256: 59ea3ee9dcde4cc05c968fbc9d1b15bcda4d4efeb12e4d05373bd0e0d56eb4f0
font_02_sfnt_off00015d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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