Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec4734a8d5ea79c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 18:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e209ffb42094a62ac9ef5adbeebd7a2 SHA-1: c9b3f1afaf7bc87470c77c42e73d74329a704cc5 SHA-256: 8ec4734a8d5ea79cbf0ad9793b507c8aa9147fff87fd3d8356e869c6da3c5f68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a series of links. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pfollowers.com/ci/userfiles/files/2689525414.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8688cb154df8f4e54c4e4b119fea7415/60378652032.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/17217874339.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dinakajupekat.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/kirafozotaxunesegi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdded0197f---wewajujakemelafuf.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/13503479216.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/nelijax.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bigaxa.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nigiwejafex.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134a98b6a014---72736344134.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/32601454034.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904052435.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/xezapapuxabebuzawexobej.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/29754245230.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bijidavisoke.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gadalof.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/wotidisevuwijulijuwevuto.pdfIn PDF document text
    • https://506hlapeta.com/files/file/20387591191.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f141a2083a90639088bc3d78e22943b9/12879398504.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b3c5507a---66834418068.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/gedobufusuwodana.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/28363843255.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/94355381394.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/22669197794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+phone+not+vibratingPDF 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_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10644 bytes
SHA-256: c855319d1c059b74daca85532f416f15fb093b8bf92c8effb9d49cb9b563f7a4
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 17620 bytes
SHA-256: c2480eae5c99c64e917890f72910c5a2df56090327956f105335377830f333c4
font_02_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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