Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ce13fe4de0edaa…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 09:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc52f2bf80928102dbba0a64ddbb3b2a SHA-1: b9ad1d921ad87a82cca01dac43823c1e584bd5b6 SHA-256: e5ce13fe4de0edaa70f0213b4fe2dd5e0b94b4d2c7ca3f26f28d6e718ce27ed0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=fill+out+pdf+form+online+and+submit PDF link annotation
    • http://arisutour.com/ckupload/files/kogedapagobuguxofa.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zeralagijuto.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830908173a2---noviwebamel.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/785cdf81dc4da627033eb9ec4f090bba/lavigalalafumo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/795372419e14e6e386f6d1552f8e2e72/65575493570.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43139885154.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/milulob.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/28753458828.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/95933715656.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/40d49e6cbabcaa30305b021ec0187043/lomatujotefowukikinajoxid.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/45346319592.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/39894445606.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab15500ce---23546911913.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/46514642373.pdfIn PDF document text
    • http://amd-export.com/site/upload/file/3129327700.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/85074210065.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f5be0e800f---gadujamapadagosizevosero.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/97653252437.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40612924093.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d76204190---xosoxukenav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b6a1877d1---98802795704.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dad28574---17362993462.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/rarasisumikakamudoviwizi.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_off0000b377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 14444 bytes
SHA-256: 6ef8e65861dd153da861304a18fcf203f0b8f2b0014ff2fcc0b6ac2454dbecde
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10876 bytes
SHA-256: 93f39eed5c144892e5c2ac1f88eab0dde09d72051bdbd65916b9080bd786bed9
font_02_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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