Malicious PDF — malware analysis report

Static analysis result for SHA-256 07523a01d5331ef0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 16:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9af5bea00dfa669d88cc153076f58547 SHA-1: 7364edf20041d961cd763a3d12bca07b2d64563e SHA-256: 07523a01d5331ef054292f9c489cdd0c01741ad24b7a2b92228ef715e6cf1aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lukasikgroup.pl/Image/files/wuzavalobatoxamifuwido.pdf In PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/95013302888.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/39066753339.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vipow.pdfIn PDF document text
    • http://jfe.hk/userfiles/96753528295.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131281e486ac---24884460175.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sitebabufufadazavo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/54216631456.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c43ba3b54---nisejido.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/mebifibokat.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066438f50e---54200840652.pdfIn PDF document text
    • http://atrsara.ir/resource/files/xalegobipu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rdgqqkkf7pa7i9u71kcj0vb8aq/74399530266.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/lejewidusapebatinu.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/kosoxudizatugev.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28699770741.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gurugesaka.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/xakepekab.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mogilorodadotiduj.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/fiwal.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/japipoxitodutum.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/rurudodux.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/22041031681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=live+football+today+freePDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10352 bytes
SHA-256: af9f0ef828bba45e2ce68989c6e072460dac09df76a526b7fe023b1ad7c2c8cc
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 18036 bytes
SHA-256: 15438d2ba0db2c8af28ecf5271b3fc83af6655341136b997ef197eb9ee31eb90
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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