Malicious PDF — malware analysis report

Static analysis result for SHA-256 86706ee090977339…

MALICIOUS

PDF

54.4 KB Created: 2021-08-29 08:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: d615b0c61e269875927c46bf6931e0d4 SHA-1: f5850c0a1fa0cb6e3f8cddd1a038281dd9def307 SHA-256: 86706ee0909773392e330ba7c98c79573faf63b02c79526812a43a3dcd22aa87
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8789

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 54 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af0e88a5dd8---81889562217.pdf In PDF document text
    • https://mimpishiosatu.com/contents/files/42942815222.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0920d6ef5b---zumokarobu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210826113820_1644649748.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/80469697789.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/dbba30e75a83cd7ce1eb0272cca22670/95624622903.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210721_B299ABDA82B146C4.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b8433de2---biwiwulakopu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/811446822cda93385e466fc6bf682e56/49104035395.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/67940614368.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/67922005553.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a4b74d517---20955760341.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097c64b95229---poxewepepebuvuzuzis.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612772c86581c---ditexi.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/nabobedulifadoletapowu.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/14305098378.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/dudowumipevumejuvumoxuk.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/puguxi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210716022201175.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f95da41183e---foxotoxekutofifanebiruzu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160702509e739f---vutenader.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plant+cell+with+all+organelles+labeledPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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