Malicious PDF — malware analysis report

Static analysis result for SHA-256 496018da45e42867…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 02:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 158b4cc7efffdee73c860d85202f52fe SHA-1: 279909c7a94db06ecfd1f935f7265031cc74df85 SHA-256: 496018da45e42867bcfe4b01a22fe59ae9eb720d213d6a00d84f5b089c56cc2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness, supporting the overall assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=building+leadership+capacity+in+schools+pdf PDF link annotation
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/49023562924.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c90f65a78c011c8b6b90aecf015787c1/begelekisekosonejiwuxox.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c18da3065---30749348627.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160820e9e50cab---80692785446.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609186859c16e---19436658212.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39130169527.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/losujexisinowaruma.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161010a6ce1a97---83360770470.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/7477258315.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8u8ukf62vhmt88i6ll798f5m0r/wasesotibatabefawa.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/savuvutemum.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d005d2b6c1---77132580574.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/31500207800.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c13627e3c---44964383711.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zuzarerapeluj.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f059f3fc---zevekoxedozolunafaki.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/49901137904.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nigobibamosi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43a6a247a---belamudamatepata.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/tuxav.pdfIn PDF document text
    • https://digireg.pl/upload/sitanoxo.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/8554887510.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16096412bca575---komazaboradubi.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/kadobupudigokusu.pdfIn PDF document text
    • 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 11168 bytes
SHA-256: 8f2b5e773df47711df8f4d22c27ceb1adbb201c16b5a2efe68963affd47ce690
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 17744 bytes
SHA-256: b12203dd7a78914fd4f73c83199953533ee6089f365fd28d9ee5d453be3b1819

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