Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8ea1ffcd9834ee…

MALICIOUS

PDF

105.2 KB Created: 2021-07-28 11:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cd5a0315759728e1316e1791f5a8f77 SHA-1: f5dfd23e75a85186ac52178031e8efb8118316a2 SHA-256: 2c8ea1ffcd9834ee768f2e07d7deb260fca864670ffb42177c50089b6e492918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure to phishing sites or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/92798547347.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/90377824c59c8357444a25c39673d300/vosuzekeniseta.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nusigoxamebaze.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/32478861026.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/98299368390.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8522d1bf9b---dojimogapapitodem.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/44793962058.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/95633453745.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/mumalozulubof.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/3276435793.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a3fc594fada7678fef4d6bb5966f53a1/50575733372.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/soladafepisopikevemigakim.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c918f2eddbe---26941167221.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/54562655019.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/65592164965.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bd38825a---59045568946.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vikoz.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4l7nubqi1occpls11h42o96upr/sedozanasifiwiveluwanup.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa82042d2d---kobekitelutifidexijefodi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nunotazabiv.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dsefk66nqppmsff2kkpp1oak7/fagamebapavipipuwex.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6cd25b3b---93253819463.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/dekejiwidefowi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3632fdcf77a0ba4ab517530db7f048c7/1598417652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=refacciones+para+vocho+en+guadalajaraPDF 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_off0001347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8E 18184 bytes
SHA-256: 8892c22b17f923785a4c111ad45bddd3696eb46b1fa7d87a7242218f87a622de
font_02_sfnt_off00017a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A27 11144 bytes
SHA-256: 4211ce1fd677858a006583d49424a5cf91c933885451423c1382f0ff34bc7960

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