Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfad9bbf9de49d45…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 07:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 217af265e0aa9b8eb27e12e6f07a2c5a SHA-1: 9aa79f9383f92aa89bbc0a77c0ebda143466c459 SHA-256: bfad9bbf9de49d453ce7dfa1abc5601546918df3cb7f99ef0e4ef4a6d511f37e
176 Risk Score

Malware Insights

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

The PDF contains a large number of links to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3401f178196964ab0004cb0c281a9f44/71615430692.pdf In PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/darexofitonixe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613377dcb3c59---35943187763.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/luzezakifijomuw.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/39678161429.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/22cf61716ae8470445ba521b43ab8ad1/42675488621.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/98477942135.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/buderijusezoxer.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/lugozepaperij.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/68883594168.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/kuruxasiwujuwujawe.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143361ae810b---64233178694.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kevowo.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/13574692944.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/nuseboma.pdfIn PDF document text
    • http://mamam.by/upload/File/file/duratovalenisemilo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/remozizulofejifa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/12094200482.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/benelusewapujulujurusuvi.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/8808750627.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea1e00e50---25827585161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=backgammon+for+androidPDF 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_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 17296 bytes
SHA-256: a5665c4d4bd3cbf1337f06b709da2f5bcfd1902780f56ed30bfbd2cf9929a8d0
font_01_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 10520 bytes
SHA-256: 959cfca380afdb011ab53937a27606f6fce95c68640b632740734dab91ec72e9

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