Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc509129971791b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 07:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98b20c684b1e8bba880a44d3826f0109 SHA-1: 25e93a45d29337a75ea14dee29911484cc00ea63 SHA-256: 9bc509129971791b6061ae72fe4ee736079589c22e551f71e2249f1fe49b52fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns that leverage compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d983c09d---28794509831.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n3cpsd5c4ofh99tr5f6j4o57mt/514790160.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/98795444323.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/210e514017702b847a694ffd16ee6bad/dudazajakakiroredager.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b00da2f08c0a4a8b57fcb8bb08671839/6101122101.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/25359180273.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8d7d6657---tebamedikuzebovijavikimuw.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9294b40d---zabetovogekokabuwe.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/62287687561.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/rigovujozurebosat.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/negibibasekatob.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd3fb178c---3902460921.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/368881731.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/31372861307.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/93483262466.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wukijapiteromosujed.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb10a49e52---derazorojozovenujexuji.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4c025837a7f7434a3ad609b7273055cf/71145584368.pdfIn PDF document text
    • http://myphamasia.net/upload/files/89619686004.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc27b3a0f---kupilowexenelodaje.pdfIn PDF document text
    • https://linker.tw/files/jotazi.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/11993874240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nursing+experience+certificate+format+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://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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 11096 bytes
SHA-256: f63a3c84b5fb9c1919184a622359d9031753abd7482a6e3ef99a12c0481027a7
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 17548 bytes
SHA-256: 504f533130caf7cc144be332b16728ba1e1d0a79e7c4061d5f74fb3e1681e976