Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4a4b4dbfa72324…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 02:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ba39818ebf51839e6d914f5d3f7a34b SHA-1: 2cb60d8ea9b7425143b8e5dfa9639886669e048e SHA-256: ac4a4b4dbfa72324e2be50fc97484374313fff3ca763357b7bad9ff97f1df040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sitoad.com/bbqjoekey/files/202109180544366176.pdf In PDF document text
    • http://swotaweb.com/img/upload/file/78410081266.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca700650d---25525223116.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/14741274233.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43805350213.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/mujisamadote.pdfIn PDF document text
    • http://xfswchem.com/upload/files/84335665718.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/risam.pdfIn PDF document text
    • http://vaynhe.com/upload/files/41876816519.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/72766897945.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bolataxugo.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/70471544652.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/97720393533.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a0732da86022551a3b81b758c599847d/89607561293.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/doxidonemibupuluwite.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/wululapotawit.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a75b7f1ca---lefepukaxudusebewekaji.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614502a8ab8dd---waxepo.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/lufekuratep.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a5baa495ceb80b13a8c2faf7fc900383/lunagofuzimet.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/guwegedarediluwomosapi.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/fiwar.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/63156886118.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb659f5a0---mijamosategawazome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=types+of+non+chordatesPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16436 bytes
SHA-256: 290483849534b4314c9872193b0c57b6d9c34fc74d205cef4b03194613d17df2
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 10656 bytes
SHA-256: 27ce8ef86bcc9f10cae3027e8b6820acf4ec97ed253bbb8f1fb9d88c249652e3

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