Malicious PDF — malware analysis report

Static analysis result for SHA-256 847fa3d64bbf494a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-31 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 89c13110309cc83e4c116e53e6ed8675 SHA-1: fa097ebbb82d6f65181c3b565c7c7bd3f54fe417 SHA-256: 847fa3d64bbf494a69ba0a932c6978ed105489463bf202859d94e8f5028a83c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=five+nights+at+freddy%27s+2+custom+night+scratch PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832cace7ca---ganef.pdfIn PDF document text
    • http://wenxuezj.com/images/File/xabanuvawitorixevunusamud.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/403c11e2b3090fc03b089808d4a457e2/tatoxuwipolokarakoridevi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8017c09d3---kitibuvasizubupap.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_B39134D596B688FB.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/vomexanikaruketer.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4b966150---55087670724.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecc33cd61---83308603961.pdfIn PDF document text
    • http://eventechsite.com/files/files/nikuv.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/feguturibesekuli.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/kejuk.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/kenezinijupiwe.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/8f32331b22a0d2dbebebfdc4bee7a46e/bebibimodifu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/tefufudon.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/beluboxuxenugunaxava.pdfIn PDF document text
    • https://avvocatoboretti.it/file/83412197042.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609088a0e129c---noluva.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/tetewuzu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/memimodidupaviwinek.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/57252374382.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4227b35c5---vifudapipirikuwazitumi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bf1dc76ddbb6c6d8ecc67829a50a5012/24902970579.pdfIn PDF document text
    • http://babamoleskine.com/files/file/zagivexa.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 18648 bytes
SHA-256: acfca9fa185cbe04b10b17727d4c7513f5d5f00e5517ab4b8531acae0a517ea5
font_01_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 11288 bytes
SHA-256: 5792072963379f43268e47052b18e95150becffd2a09aac80f8c9549cab2e7a6
font_04_sfnt_off00013a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 16484 bytes
SHA-256: c60d2d26ab3396dac41cea99ea360b0ad99c199d9afd689f38f92f638210f130

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