Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72c8c27e275a26a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 20:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfaeed6accec34aaa2c0ef46c2f44f2a SHA-1: 3966c0cea574d010694f1ef50e16fe76804e1101 SHA-256: a72c8c27e275a26a33359e760a455a4f9367c793527cada8726cb3ac1d292819
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised or disposable domains, identified as a link farm. This technique is often used for SEO manipulation or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e78565a8ecabfb486d705811aab44516/66982885144.pdf
    • http://phdpecs.hu/userfiles/files/nowopomimututepokaxolo.pdf
    • http://alnoorcity.com/userfiles/file/fakupakedoxanomo.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e6950d0708cee10004732511bbdcf2cc/gebijalodabob.pdf
    • http://bsa.by/ckfinder/userfiles/files/zesute.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cc6405efb2ea527acd3f033889f60feb/wupozerozorunu.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d87716e0d35ddced81d2fd091c733484/toruwikijip.pdf
    • http://starrwindow.com/clients/863399/File/88210975001.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a0f5c638a0f97a8d5b44d6f113353583/61444742262.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd8aa8b47c---feruzifoxenukamut.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f99a5c909---58060090142.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab37c60dcb---1940613352.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/96p3ci6a7bs05h1lkvo5u5clgh/niguxepuverajugozafujodis.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9652e50ab4---vadixu.pdf
    • http://worldnaturalfood.com/image/upload/File/92008857334.pdf
    • http://jncs.kr/page_data/file/20210531013421.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017e7638a6---14965481504.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b341bf73d---22602942286.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d708f9818f---tovon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077926582e93---raxuworewiruxajuvak.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ctp3rskhs75rl4j6hcr1fp9ltj/72351149537.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/62493033208.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b4d3468f---wokelutejakogeletosixo.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efb8d0c3f---48795563082.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=foundations+of+nursing+research+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
font_01_sfnt_off00010528.bin
43b22e647192d5a0dadb88cac9371ae083a9310ee54045bb307b845740cf9196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10932 bytes
font_02_sfnt_off00011e37.bin
4906adb3afc26400e74f0b5ddba8fe5ad52624a4c64c17b634802d272a7472d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 17412 bytes

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