Malicious PDF — malware analysis report

Static analysis result for SHA-256 9666c45ce6180fc1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 15:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ad8a481c6dc9e65e6077ff4999fef10 SHA-1: 185624f6ae6ffb1a6b4e66e4121af757ba9245d6 SHA-256: 9666c45ce6180fc14c35fca1bf8a581aad5462168a5a96bc86b359ab0a864d02
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a543ec9dd6e---gibuxukidukiruposizetovu.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8db3a03c---semofazagidode.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/97869853081.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/mipatunew.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2bc7628fda3005f5758b05bffa3e6f96/vewudido.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/50599713370.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s54g3fkaj62kr30rf6a096mluj/63052277439.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/39684294943.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/pepukagurakonepiko.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/fitefurobajoz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a071520ca---zavaw.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/dawopirabodonegajogozosi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9cb261fa---35723685688.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/81561463246.pdfIn PDF document text
    • http://fpole.ru/sadm_files/wuvubimojirumulewo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/bugajifikuwurewafagirorij.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/t083q6kbh84i2fcd2vj4813634/pezorajikulekabilov.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c03a9408a---31383705367.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zazegutefitedopojo.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/12421578462.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/35757353332.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/78660485a37966bf4a817b4d2fdab96d/wafukorusupiwero.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/474d9485a4c84488f0d6ffb7386d1643/jadozikixegurupi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3416ca121---25815497248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=proportional+relationship+word+problems+pdfPDF 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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10988 bytes
SHA-256: 55d5373a648e816f5b5e2817767e1739b1751be6e23b402fa43b976322a0b2b4
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 17720 bytes
SHA-256: b6fc8c216b17cd7ed6975dfb2210e07f0ac3d09afe5bcf39e8a5dcdf4ffbf112