Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9c57f43d601cd7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 14:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b3f8656a5a1ee15523eb7f6763fbc4d4 SHA-1: 83a8fcf524746483e09674e5229d69d7c76881d0 SHA-256: 7e9c57f43d601cd7aad96ed6682568e457e481d449f272b2293d707f539edc7c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with many distinct hosts, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pk-kuepfer.ch/ckfinder/userfiles/files/47151439002.pdf In PDF document text
    • http://gyorszol.hu/userfiles/file/ximib.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905075440.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/df7fc30fc2e0d186e778e4eb49948211/dalorugu.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunepuxug.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nkmnqlloiult6ll09s86l1mte1/raximavudedivigi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2734d802671a0229c98f6401eb6206bb/89197596340.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0aocdkdrfqjt4r6ig3nmj42p40/14888842395.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86006832971.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/lazegufilelujiviwimemeva.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4580e8ec89d04f1ace8239670131f1f2/fakesu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d5qktp479h8uglanp9n1tqiig5/12478172179.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/81274120864.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/89075261160.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/33564312877.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/pogeb.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nenevomaluk.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/db82a4f59a001eb433524da262a15a8f/92816406789.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb62ac65e---bapisuvegomatirivavap.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/55281030674.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wulikuwuferozi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898b451deb7---61613637549.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/14150686494.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d720be87---bexudelajavibarobolitefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=daniel+brailovsky+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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 10808 bytes
SHA-256: 52d78646be95a39c1268406b6fe90426158b2bf0682742ecb891c10e875473d4
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 18208 bytes
SHA-256: a25e51a2087dde24f64f0eabb9fa40450e71bda396b8375e99965052048c4848
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1