Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1feb5bc499db08c…

MALICIOUS

PDF

95.5 KB Created: 2021-07-06 02:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6a155c4f9951a1e0c35974a970df332 SHA-1: 066e226eb4649eb7af2be4a834197622b07a7348 SHA-256: d1feb5bc499db08cf0836d1679e7090668ced9e3edfab180413e8db98782b182
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and a link farm pointing to compromised WordPress sites, with one URL specifically impersonating Amazon to lure users into a credential phishing scheme. The embedded JavaScript likely facilitates the redirection to malicious URLs or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://ketchas.ru/uplcv?utm_term=best+book+for+vedic+maths+pdf.
  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=best+book+for+vedic+maths+pdf PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f175ed1d899c911ffa3c939af94784bf/zelomudojaza.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0fbb483d3b8643121583f87f75ec74aa/nuvosude.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/kalizefofoxovagefefaf.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bda5ee51---zotekes.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/34947008741.pdfIn PDF document text
    • https://ckmandarin.com/uploads/27897759182.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7fv9ctue2e66t42mn1m29uai60/milot.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/52153b3b8afe08438f9ccf7bc42e63d2/jizizipuboxed.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1bf80ba37d7a937fa2341017f5c7ae10/733768387.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7840aa0065677a62dc585ea668251393/modezinanazimakowokat.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5d2e99301b6c25c1a7fe3dc23d12cc66/banivovizadawi.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/xiwufegirewabinag.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9e616d86141197e34ecfdc43c294732e/37120315763.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78f44406a89333a7197930d551164a40/mugufakezupuzilokejap.pdfIn PDF document text
    • http://sparkpro.lv/content/file/46762916445.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/99f13d26d67acb262e247a480b154235/jimewexux.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/lujuvugifapajovinojowasi.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/gejawuguroluwu.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/devokopub.pdfIn PDF document text
    • http://fedoro.ru/upload/file/tanalerujonusexebaselolu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/13828229139.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37ba886e87---velidesagulapapuxezibi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7edd555aa2---166201608.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_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 11084 bytes
SHA-256: 60e11527621a6db55cc8996dcb568ac6d403b08fc82d3696dfa238c87d78a8e9
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 17764 bytes
SHA-256: 513227c6500330d56679263678f12cc5601df62c95615992d9c64a6733bbc511

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