Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae643f5c35c9c91…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 22:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd29c3d352ba4e65a3dcbbb21f0f1a95 SHA-1: 149cbdb1a116905a37f1c256d4f402c8d5bef95a SHA-256: fae643f5c35c9c91d40d8348f1bba7586801500c1fa6f8b0271adc77bca5c18b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to a compromised WordPress site, suggesting a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm on a compromised CMS upload directory indicates an attempt to disguise malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f1e95a9a---2656151441.pdf In PDF document text
    • http://eperon-kochersberg.com/img_db/23595820926.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/80258754340.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/18197305571.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/26798823992.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/27789764343.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/fexud.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/75760691345.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614959eb94b4c---latejupunabowudi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/xotenupezoxog.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/80405914414.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tenojoja.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/21c6541bef796ca85fe40e52d8aed97e/vowomemurizuvezofurosuk.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/40623218684.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6629410889.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/63016631656.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/19609675090.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b2b7db64f8ace490d55ac8a605062f5/90559015491.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/jadija.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/60129567952.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/99428542724.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/fenasigemifiwuvogufune.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/lebefoniniweti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+unholy+bible+rev+cain+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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 10832 bytes
SHA-256: cf64c4fa84c5b5bdd09491ef53350e55f58d8dbc0b931f71896672f38e6d604c
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 16656 bytes
SHA-256: 40a935072045411f60354ca63801fa4d0344eaa7cd811a61288d1b067a3ceb15
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1