Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5db510c16cca5f…

MALICIOUS

PDF

100.3 KB Created: 2021-09-04 09:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7870af9f8bb5a4ab20b2b95b631e9e3 SHA-1: 357f06fdb3bf64cbf1dd2a8828fb105384601571 SHA-256: ba5db510c16cca5f5c2557aecbf28255c98a255c2ea370dc2b8ddcc9c3d5c736
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or 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. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=ayurveda+books+in+gujarati+pdf+free+download PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0e4e16f1a985b305850021160e4cf3e7/67479702725.pdfIn PDF document text
    • https://ikansambel.com/contents//files/gamavetej.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/jijam.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/65093210701.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t9d35hjt0b9kmkqe790mh1urc8/pagoteduzazogileros.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7406c02dffb7a04f6d35617f52c99b8b/8982448014.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/85844519857.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/returawilifuj.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/xiwuxetomivawozorefibofo.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/20429939827.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/eeb84d22c479ee6beb2174c962f7d8ff/52387663466.pdfIn PDF document text
    • https://anup.bo/images/files/87660307539.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sotaragonisupimopajobuwun.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/dadisukifaxatifuzos.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/4t3umokrte7opnokd564h99lat/zinovonawisiroxile.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/40623924569.pdfIn PDF document text
    • http://gptools.net/userfiles/file/ramisixaj.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/54670994896.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9387958a3---tujufenorekeforomipejo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9b9c1108a2c78a4263a91241c5821633/85215232470.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/juvojebemimu.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/19551411244.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/lazadopixapevumit.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b87988eaf---volitubewiwe.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 23572 bytes
SHA-256: 5aab6a2b9fd48e229d0bd01f80310abef1bfacaca16f89991ab30c012ec0e8ad
font_03_sfnt_off00014f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F92 11380 bytes
SHA-256: d9d19cf6a4f6378f37c75c4334756a09612e3853418f2ab0aee7491f17b365c5
font_04_sfnt_off00016a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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