Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde238a76ed78d5a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 01:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f96d45f67d146f0ea3067a4a627e45a6 SHA-1: a29ca76383bf715e95572fac9861d9fecdc6893f SHA-256: dde238a76ed78d5a6b5ab96e0c66ec34a06bf330c12edfe6206b63a3dd9889a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=irc+chat+commands PDF link annotation
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947f5ca9af---mageg.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb8ca13e---7700346303.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d08c223a---woloj.pdfIn PDF document text
    • http://rts-3.ru/upload/files/61883375688.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnnu15s0pvk9ekcts3stjs38ob/77143944562.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/afhg0v1hqtpigk4q0vagb4dr16/bufigajogiwixuwiteki.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v03vv74tglnshrbtomnqtp55v1/98207601380.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/63553722157.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e95ottfm7gjfticceqq3veceup/rigeb.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/196e3b4866b9e295eb9eaa1def2c25b1/95776038132.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lulub.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7448e20451---88183286996.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/24781008163.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/31770223633.pdfIn PDF document text
    • https://unosms.us/userfiles/file/libosezutitutorujute.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/jodetowo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2f09551c---25198145494.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/m1trh6qmqtojfev3ocv46i45ii/16513285823.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/selelirog.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc026934fd---nonemefedapemeson.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/datetuduz.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/ziritozusip.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/fudubaf.pdfIn PDF document text
    • http://debden.org/userfiles/file/99673529632.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74daf421c2---87387025065.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 17548 bytes
SHA-256: 25dc0776d5eef7138a89c356fc014209c2f1b77744ef3157c75e078f1a646654
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 10316 bytes
SHA-256: d58fd2cdbbbb90dfb01bc6ee87d6f44671b1373343bfae1749c65ab66167c5c9

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