Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29a5eb1b0a5771c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 11:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f77a8d41ec03a025d8abf72aa4a21524 SHA-1: e734d6a9c498751a34aaa10aabea893a1bee9a90 SHA-256: f29a5eb1b0a5771ca0637ac271ad5f444cec436e3d428b3bc54cff1e37763e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kleinschadenexpert.com/userfiles/file/taseguwivuwireraza.pdf In PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/27125618213.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090710502173499.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45378907.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/56976818465.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/604e204920f0530d0ab56aa59dab2be8/20976091351.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/ritekobofeduxoniravugap.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bosopikimuritoge.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/vimubebojowu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/wifufidijofedegig.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ae75d762428eca6caee7422cfcd76395/59690892368.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/megarakumalupufixumapog.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/75283991390.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2481d7e3---77936906761.pdfIn PDF document text
    • https://ienter.bg/files/57077626555.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/sidowoloxukuledadomi.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/55820868606.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/21788776535.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210915202118.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/97961433388.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/87284611260.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/73885101335.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/43505034049.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/benuxavas.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kenetose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=omegle+tv+video+chatPDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 18024 bytes
SHA-256: cbe27ddd5ef4bf55ceeb20854bc4022deacdcb536465413ba50f9984dca4fbe3
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 10536 bytes
SHA-256: e6d94cc5a8f1e081fee7a944dadff7c65f0a08b8db491043d817e26785907066
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1