Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393452c6fedea81…

MALICIOUS

PDF

92.3 KB Created: 2021-09-14 12:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b0de417c8b799466bf66dad32084b82 SHA-1: c05b71f07647aec2a1a956ac814de5fead4ee719 SHA-256: c393452c6fedea8196c51b8221a7f7428c0e3a6acb26168346ce2e32cb76e9d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • 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://medeeatour.ro/mm/file/1561792056.pdf In PDF document text
    • http://ristoranteyuri2.com/userfiles/file/tekog.pdfIn PDF document text
    • https://datenglagi.com/contents/files/papubeladarij.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/76746369056.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/palagafogimisupakarabuve.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/92035697666.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/keludotanotupel.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/kodigurexerodo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/444107359.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/26830058854.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/6698735935.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/91644636492.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7c2a899b---58933187771.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/1983699761.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tiluzebi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108c1779e6---vudorulibikexisedu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ed85559c---23949409156.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/58873728453.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/42306282089.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gupuborukexijufufiruwa.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/17876361052.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/zuwonipelutodiwam.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/guvelumirap.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/46587959740.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/mivanomasefegepa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2016220303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=summative+assessment+definition+in+educationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 18708 bytes
SHA-256: 51019740c159b0b5beb85b9906ae84fce5709b230ff728ba55b32d86776fdd1b
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 10732 bytes
SHA-256: f89b0ee6e49c138350f0d45c67dd6bcc49e80ec9e6b1670d06b5788e272881d5
font_03_sfnt_off00013a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 16020 bytes
SHA-256: 005f3074178ca729b098879c0fcb78235a4ed868ea41992735190f69ab972732

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