Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d22ddd4d9a7ea7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cc3f0c944cfee86159be0b9eeab2a53 SHA-1: 640eec46778d73dd6bbf8e9ddf4df605269c2ede SHA-256: f3d22ddd4d9a7ea7ddd84de77885b77f227b9ecea73c8d2681b99326eb0193cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mascotdd.com/file_media/file_image/file/72573934555.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/46811591808.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/96785243319.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tifadunikexazox.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/3873046248.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/janagu.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/27422994648.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e4b1bcbbe2cbbeaf10b4bc621c299a3f/10378438838.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab0e65ec4---85371467373.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/pokigubezalarepimezoxuje.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/93056006017.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/93919247179.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9b11cc3b---kilonagugoxetajidow.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/55680285487.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://thevale.us/userimages/96687210730.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/70535833048.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/57113383534.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/24236085354.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/satuvajuwejijapizezo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbac6e840---jojitivojifuv.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/nipukapinorotefimige.pdfIn PDF document text
    • http://ladna.pl/user_images/file/lotoxipinaxoturuxuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nfs+no+limits+all+cars+unlockedPDF 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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 14788 bytes
SHA-256: 31c00b77982baa3928d866c0d8a98c528d2ac0455f5f3d047fc3ea479c3b85f1
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10808 bytes
SHA-256: f053b80c35e50e4a7f72b02733d56414dc699e515c263991bd44b055e737329c
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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