Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b7ca3cd70de0de…

MALICIOUS

PDF

139.6 KB Created: 2021-08-19 18:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30c5c956c2bfffca0b3d3596824e2d52 SHA-1: 5b06dd0783e6a36ce6c1d5ac547a4e47f44f442c SHA-256: 12b7ca3cd70de0deb97b4359130afbc359cb965e0bd3c6568cd7d8ab9dfd8f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e5b99aff217b56b160b783a34575335a/65113118235.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/65084766897.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4825e6df---boxibogamedoj.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c22b7259ca805d8cde86a5aa807db841/2687039303.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/46867190465.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/71644840108.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/mifamegikoj.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/livibunilerewuwifosi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/60a71ecdae5783c37c36485371febc75/ponidigarokaparedamesa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b46a64da---barixutenak.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e32c108b---58783601688.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2964a574---tugixagar.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/256a09a307798592fe74c521cb2bcc30/76794293161.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nozelazelifadunotunupugu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/tumozilenebasekedijusuk.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/52604460958.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/rapipegobavopojawulireb.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/43008345237.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/28350068529.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad062f88---xedarebizobo.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/64235952613.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ed28c72b---9978245027.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/mupakomalamifiwew.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e339e70f9---zizimomipajipaxanaji.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088430e91ab3---72889943521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=movimiento+rectilineo+uniformemente+acelerado+aplicaciones+en+la+vida+diariaPDF 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_off0001b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFF0 10940 bytes
SHA-256: e6759924fd48d49e31459920fae370a64188bb4573adc4527778e817c0646f02
font_02_sfnt_off0001e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E94B 20600 bytes
SHA-256: a9e3a66077a3e645b74fbd28b6cdb059d911cc2b51be912f8d0f5c4c6c04bb6f