Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cde6ea772b1ec1a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 21:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4aa84a97c1edbd84114e4986dc0d8201 SHA-1: ffbfa79ca8037120aacb9e2d49e6f2b3d6dcfee8 SHA-256: 4cde6ea772b1ec1ab1d3c2b1bd234790c4ccc64a3ef994069d43878055bb74f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and link farms, particularly those hosted on compromised WordPress sites, indicates a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=watch+online+telugu+movies+on+mobile PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d7a2eafd390ffabaa0511851caa7f272/kinalokukasobipobubarilil.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/jixasulezejagulawog.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b7285a4712ccf42d3bfb23b989863c3/kojevanobiduvulitoli.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/32745329363.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/27ad6c525f2ace8416cd4c734fe1a120/gosemorofafiputa.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/99311200703.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/luwazususemoni.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613511b61e649---96215181534.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/27117018991.pdfIn PDF document text
    • https://cartolmania.it/file/51728995744.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/36536295245.pdfIn PDF document text
    • http://billsky.ee/files/file/2884950473.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/10536000250.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/sumupivusomusawiga.pdfIn PDF document text
    • http://minhanh.com/files/safisalesirogo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cba316c9cf31ba971294e6f7ce91199c/16106986768.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/jobepebavigifapasirofik.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b686d68df---vobumazavenele.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/pikagalen.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/72964969167.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dilejebaxugo.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/popuzevolaxofepamafoku.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e754265538---totadubesotepej.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_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 10876 bytes
SHA-256: 458aafc956963c8a45000520a233986bf13a6fefe9ee7da5f726e15139a8e080
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 17424 bytes
SHA-256: 3091b6ce7da505d867855398c5fb0552d5ce370513a6ddcd7449825c2d46e6e7

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