Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cec35ada993e0bf…

MALICIOUS

PDF

76.1 KB Created: 2021-07-16 13:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e835b56f4cce8392158bf2378c9bec5 SHA-1: 911137f9ce071f48fd5aed2108742a2ddf734cf6 SHA-256: 3cec35ada993e0bf1622c99174ab4edbf05595a05dc859c12d7fc408de8de6ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be leveraging these links for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=pdf+document+is+blank+when+opened PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8jc1l473nim9hvi97956id4ofp/67888890510.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9f5f56afcc2915b11892407429ac5f65/dizolemerivabebebose.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210614/file/popenox.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/fogukoxe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/99ab171d78f147fbfbf14445b8dce1f7/nubekikerozamijoxoxono.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/64948921808.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc32ff3653---lesebadowil.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7c46db4c---16482402708.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/59676843586.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jasosinetemewomadas.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/minux.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878ccd7816---gagagetisi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb64938716---28012298133.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/k4bm8a3cfujc8pcjjcaa600mul/kowipijexupu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a35dee61---77438425057.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7042760548ea2a4890c3c0674a8ddc29/viraxiruwumopezetofusopi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b097b062c27---loxagegokafojiwati.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/37243071866.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/70890843049.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/tusogotomezal.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/56652103291.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cp36hdk7acc2i0mgdop6o5r4f5/gadabo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8c15059e---pufelurozomubudazezowiru.pdfIn PDF document text
    • https://kawanmto.info/contents//files/2947713571.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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 16004 bytes
SHA-256: d2084bdbb98451e0ee3f5d99b00e1e19a809c4cd63fb6bb08ba0ef6fd551afef
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11204 bytes
SHA-256: 8c5cebdacf8fa214eba76e0a77d9f2d42a104f9807f8bc558948a089ac95b65e

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