Malicious PDF — malware analysis report

Static analysis result for SHA-256 394e30a5dd0bc201…

MALICIOUS

PDF

75.4 KB Created: 2021-07-20 02:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 03eff242d44c9b4ad06e4518805e3dd4 SHA-1: 5589307d05ff4a41a2284e9c31d2d76ec96cd303 SHA-256: 394e30a5dd0bc2017383b65edf94a9d03bc0568f924398c7afab2ebcf254babb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to SEO manipulation or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gdaniec.com/upload/files/fibirazosewuxukazidi.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2cd7ff72---38443987957.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a4712b7b6188964a4c2f3dd869e743bd/83438344254.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/10438345001.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c2e58850---33468019857.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/45154686335.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rogomolirazonoluromu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f8d03cc4772011312299b0fefc353826/3434840015.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10216364df---kudilenewanag.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608258d8e6736---18659114924.pdfIn PDF document text
    • http://midel.me/userfiles/file/metisaper.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/9299046036.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/kezelikigavijuji.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/jufisazus.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r1nooiktu9dnjfifledggig641/fasonijipam.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/466337a3b115d4dc50bccc9ba13390be/sadijojamedijabi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c59c524c---mubeguperelanutugelip.pdfIn PDF document text
    • http://e-hematologica.com/users//file/lagodutufufafited.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9f61d61ca26f17764698490802e62503/resoxebewewuzawidibeg.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f173678fd6---denemexibogitifezoje.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/97331112150.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/7277156282.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/21fa2c8eefb54d4b351b6c09ea62e678/19820024486.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38bb4c6cd2409afd7a75c4de8f3862e1/tuzoduroni.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/pazipugixeboxug.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbe1a7bbf---52770218076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=their+eyes+were+watching+god+quiz+answersPDF 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 16076 bytes
SHA-256: f4ae416be991d06cd6d4e387d5f1c8bea15d53128429d7ce63b26b8c13645d52
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 11072 bytes
SHA-256: 89549622c2cd4949c37dac34122d6215fcc9aff3f996b629494c568983cec663
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1