Malicious PDF — malware analysis report

Static analysis result for SHA-256 f222cdc9447bba12…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 08:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34d9845347af4740a93b9bae2e92fc10 SHA-1: 635097c13fa3a72eab3c6762ee1681a15c147277 SHA-256: f222cdc9447bba12fa053355938f901b9d32f6159fcbe368909fc5cfd2774bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://psg66.ru/admin/ckfinder/userfiles/files/14014972852.pdf In PDF document text
    • http://mindentudor.hu/userfiles/file/jewunofafukuja.pdfIn PDF document text
    • http://sergeybazarov.ru/file/4236525158.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/33441767189.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/23460688166.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/fesurufonawikowivesulak.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/salulugosu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef8c04bc5---ximopixutuwawomusodol.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/99298491784.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/rasudotivisujutepop.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210917031519.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/405b86facfdef486e18eafbf8c9bdf56/gepuzagexiluzewajorafibef.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///63788258800.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/bedubovigabafosofupitu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6590148a---75375075692.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/merigu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/pusajinuno.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/9222468884.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/44490541170.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/rokaxaxulawemifa.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/weluxej.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/xelum.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vemovazemakunibebalasuj.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/sogixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nomao+camera+xray+app+2019PDF 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_off0000b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16060 bytes
SHA-256: 451c151dbe5e9e87e8de1ae2e3fb74572eb9cce9d413418e7096652415ab901f
font_02_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10684 bytes
SHA-256: 7070ad0434cbb769590265a64377154619f1ad59f8826934ec53074600d47a7d

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