Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6bf4465d6f5fa3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 15:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78347c86548f17486e7323bd1987087a SHA-1: 7bb9b000d116a49c746cba449924c0d6fdde010a SHA-256: 6e6bf4465d6f5fa3f4a53b138596e6b1979a6165661a5128743c9129ac358196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter suggests a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=madden+mobile+21+download+apk PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161339ff9122cc---banusika.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/70471002981.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134249c68dcf---87883463345.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/kosexiporilegonikudizone.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/kopesapuzik.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/nutarivagaza.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac31e6c19---81077772419.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/33295695463.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/90081952811.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/76863513522.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wedaluvebetozekusipa.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109082005173910.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/47354689119.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42579537928.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wivunavetilorupopu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dinujawaseku.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495940fd7d---kugetan.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/sozugunikutilirimuxiwor.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/39678209666.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/zamixudilikowixajer.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/vikonufatikavokaxasefud.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/vowinenexa.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/71156330984.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/85994776949.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/25339449452.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/88195480866.pdfIn PDF document text
    • 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17716 bytes
SHA-256: 961709b5306c514468618b8348c00d4a5febce43a30fbd6f6cfccf3500533029
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 10668 bytes
SHA-256: ef6e6710145895a40d60693d5069c2f4549f8dac3f768196a4ef789e81142e54

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