Malicious PDF — malware analysis report

Static analysis result for SHA-256 558c50606c91036f…

MALICIOUS

PDF

84.0 KB Created: 2021-07-24 08:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0cf201042175a708cfb1b39114256c0 SHA-1: 4457685066b4fd28b89f40d3149b7ffd9cc1372d SHA-256: 558c50606c91036fe6e5a7da060139dc61b84b095e546d7858b7bbeee9ac2a21
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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or credential harvesting attempt. The file's structure and the nature of the URLs indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7a02bd5---31712665468.pdf In PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b67fae1b979be980c9ca38f78bea679a/39469867771.pdfIn PDF document text
    • http://3sdent.com/upload/files/97140976958.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/25233237326.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/acc03eb032c7c719a6a8e02ce8292b2a/sofakejabakikileka.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160baf386847d8---29076725056.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/12355262984.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/14o7o8r2ae4le23kt7b0lhade7/25660881688.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/viximofaka.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/93740101829.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/57224369367.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2e4b325n8gv73e3d8f25vmubfr/dafudapimobiritanilubes.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/selugub.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/xixerujisopulimuxulerubog.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079322b0a64a---87777910636.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gifugobovifipat.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/xogilewawukovinojuxo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/mhrueijp2b6q36a1qj9dtkq5nl/2460884141.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l9hmtlsk923pcnhg5u23ig81j4/pisofokukiw.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/77925443922.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/625e9ca14d6c110275c8687ee4b37dc5/87966216923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+a+blank+facePDF 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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 18228 bytes
SHA-256: b95b88ae809d675d91cc8e66d2dc57d30f7f733ed501bd4817698af2e67926cc
font_01_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 10520 bytes
SHA-256: a53d4569d98443722667ac0fc10e1e043bbce8473af85639633e099d2ab947ce

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