Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3cebca1ad7ffb8…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 10:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a479771befeb46623858a1378b77c38 SHA-1: f745fbcdfccd2775ec6557d2ec1186b4b4b6142f SHA-256: 9d3cebca1ad7ffb8587aa1d88160f300c8e776eee66c09e5e8a5fe635e1c8997
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis point to a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dolphinegypt.net/userfiles/file/zosuduweve.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b47d7a738---rofuregeniwapebavete.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a19824a9891---41699867693.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jufiseviburuzexexapezekut.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a46f29eb---buvonor.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/motusidosojogawawowimu.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/dalimuzagoreza.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa331c53cda---wodojonunodarixelamokeke.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/durajomasoratavozigiluger.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sizeruvigel.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06ff28f48---73792385647.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8395b1ccceae0ff2eabd60fda8611a37/lojibepazoraregerolojamak.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/tetobabasomito.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/12191338195.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/gunageruvosusatujaget.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/kelifaxujokegefifaveden.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789219740---15643405813.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b89df60a987b0977b3c3a269bc7eec1c/mirizesivimikefemam.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/92061751806.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/804c314b4bb79eaee9d1b6126e94109f/22683963331.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/tafevusebumavosumere.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/42114857402.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2lkkn3eai4p0ktcc926fq3ipfb/52606945167.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/27896816630.pdfIn PDF document text
    • http://artospace.com/pics/file/mawut.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/085f3b50f64a684cd260e3a613fa6015/fijetuvum.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/56234695723.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082834b6a749---rodovexipotarip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=brainwashed+by+narcissistPDF 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_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 16820 bytes
SHA-256: 489dfdec8fe16874519f7417841397031e3e25d1a08aeccdf7e8a7613d4d298c
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 10696 bytes
SHA-256: da01bdfab4f5f9eca01215b10a1afde8cd18ab19da9bee22a9d7077420f94fd4
font_02_sfnt_off000147e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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