Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37bd371d65defad…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 583b3eeff9ebe3ddb48fa362373f949a SHA-1: a7dbc5ff7a634dff0798734b83e41e6781533a81 SHA-256: a37bd371d65defad70993ad6ce0bf57038531d61f33a69e526acf690926c948d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of external URIs and the link farm structure suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b16572a6---zibita.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160859d1b22308---jevikuworosixetopegur.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/34a330091961fdf6000bec5aaaca9fd8/gonexujerodosufe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bfc798c956d8d2351d8e5c265c951f6a/ribarisapifikatimag.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5a1aac74fef44b73b34968db7770f6f9/44006568040.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlm4hi7u7nccr7ei4tgfj28pk4/vurovebaxisawafam.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/maparudoruvinoveso.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/dunetokutekam.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/79926163293.pdfIn PDF document text
    • http://www.toptehnik.si/images/70006469069.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdfIn PDF document text
    • http://intertribo.sk/files/mewikurisabukem.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160da594804832---25909459559.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb02c6fadf---22556702525.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef60b7498e---pifekebotamesal.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bda9ac505024aa7fca609d0a9b028620/27663772481.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/bujudiwejuzobuli.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7921b33592df02c021a189898f1e4cd6/lojapijufani.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/dosew.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/55652892efb1eab7169f848ffa9ed7ff/59399729711.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gheqrd3vb98ce1b9r8hsvajgab/mizasurope.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/funilir.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/24375873025.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160750e35b6619---zezojat.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/rukuf.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e16318bb---kibolobagus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gestionnaire+de+stock+formation+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 17784 bytes
SHA-256: d2e77205c5e69b9e811e13b56c1e13ba198244b01b614de7b27d56316b47923c
font_01_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 20640 bytes
SHA-256: 107cbece01b01360521e85fbbe1dd27329a1c817cd7bef79bfde258be103282b
font_02_sfnt_off000141ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 10864 bytes
SHA-256: fd4e61591ea7440641e641be1258bf06ef6df70ba1499ca7ef7f9c48dec8a4da
font_03_sfnt_off00015ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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