Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc93acddb8ded84…

MALICIOUS

PDF

89.5 KB Created: 2021-07-20 00:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2b8a122a1d7110b35b6a090b69070e29 SHA-1: 04eb9c1fa54fc5ee28b05ed3b715ffd938df1b33 SHA-256: dbc93acddb8ded841e6a2cda1bf182eb11296980abb79aed9542a50a5cf2a0bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous malicious links points to an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb624cf7b---senizesobometefezowoles.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8e964208---vakuvekupugi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6954e0e08c5aacb1b99bd41d0fb9b5ec/lusilerinexoreneperup.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/62bb8d9c5f8c1647b1f2510a045688d2/48912183858.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/650edbfc4721ab32470bd116fc42df1a/29728351241.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8721405724.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/bagevototupeb.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jifapure.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/valetifodege.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cv0bqku7j55bnl907fgbcn2a1g/raminubonutevi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b1cd628f---xagafazigebisazo.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jorifageritikosupebebo.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/riwojevuruzun.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/95000387299.pdfIn PDF document text
    • https://t2sc.me/userfiles/31756781244.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ock87poha9l5l8e272jp0lroh4/75763728733.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/284fe72307696c8cd94a12812655718c/nibegebekegunubetonipo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f388c2ada5875abc9d46bd251ef3aa94/57347520146.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/palidu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/96944930437.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/kafizojepudefi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hbq6ffii4j02c5mgadhl3m8f7e/wujezegajuvux.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dadaacc1---duvifozekud.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jidofibupigad.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/28099129771.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/66c8d498578bb6d9bd9ccb3e7a2510c7/70245611520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=heartburn+and+tight+chestPDF 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_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16996 bytes
SHA-256: b71e674a3576470e58bb8888529c76ca2d8c187eabd8c6275283c7ab32f5590b
font_01_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 10716 bytes
SHA-256: 97b9bf1cf346989c25178d080a9b22c91bc23af41f286f303c8f511bde774e3c
font_02_sfnt_off0001409d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.