Malicious PDF — malware analysis report

Static analysis result for SHA-256 b076cb7a7cb59491…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 11:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be21641c0f3aaadd2922e6708bf4be85 SHA-1: 2db7ae598c77706bf4f81bf0d7c41d4850a68b80 SHA-256: b076cb7a7cb59491b45622b600d4c35fd7344452830d5b902bf47d8beb7c11df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://studiotrusso.it/userfiles/files/batuva.pdf In PDF document text
    • http://123flower.doweb.kr/upload/files/kajefekowozuxuved.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/57741731581.pdfIn PDF document text
    • https://wsbtitan.com/images/file/26409599614.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/93952597641.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/38590974135.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091523142473499.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/mudomodetuvelede.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/47674657771.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/juvugemijowebuda.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/kepoxem.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/zikiloriter.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/sebuvozuso.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/77c6976df3a4b1dffa4bff60aca85d08/31920124660.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a2aac1c6---pijamivavokovofubojuvep.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/vapodekevamibavigokunov.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/11423370226.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c53ab0168eea3f65dc1cd06db551cb7f/82402401898.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/30280168579.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161495bf11bc4b---20270283515.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/62139715195.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/35945239267.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/kirafutavixoderojizuk.pdfIn PDF document text
    • http://cartopack.be/Images/file/46649179573.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3c65ac6b145946d53deffd0f4997766c/tobugemulugabun.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161360f52af9fb---zukasofuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+2021+tadanobu+asanoPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10804 bytes
SHA-256: 7058748d246b8bb1a3a230a473fb2ae2a3f2441b237f448dbc53e2d2f2cd85c5
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 18196 bytes
SHA-256: 38debf8a5f921b0e0b89f696fcedf6cfcce049f58d829d8595425d868cd46837
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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