Malicious PDF — malware analysis report

Static analysis result for SHA-256 e982b655f1e4916b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 05:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0635fd74de49384f6ab23ffca213e48b SHA-1: 7b8a5c863c0db54270afda10486a4f2dde90d6e3 SHA-256: e982b655f1e4916bdb507ac10e6f03d588339add4b0039775533c2051f7f3ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136629112cf6---bepipodizeginesaz.pdf In PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/xaxoru.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160928c3d7208a---gememurexomojav.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/63102091475.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a6e0a96d---pomixunopifo.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/wefabudevuvinovupodober.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/fujudate.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113971b90c27---pepokodi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/09306fa5945178df3c115e7118a1ac95/raxuvivepija.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/gijorofobigumupowukolote.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93331672293.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0c0d29b6---69736968860.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/niwaruvodabul.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c1e6ff2348c3ee84591f4c98529ff0a/wokufugabagapifuj.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/2786323310.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d92eff19c7f780fae7892378fef2ff1d/timamutewatolarigiwat.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/muxuvazipurisaxumodok.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jadefaf.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/12337934534.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3a857603---95444344002.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/27039159029.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d62863ae6ec---nelexowofofepogafu.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/84939329830.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/xepemegelibinuleru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=salmonellosis+en+ni%C3%B1os+pdfPDF 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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 19404 bytes
SHA-256: 7c02331b5c030e882639d01c74d0fa59353303cb2eaef286279ccfdffc4d5c53
font_01_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 10740 bytes
SHA-256: ba5254669daa94961b04cdd9dfd1f4f4fa90b67b655a3e9056008427647cc08a

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