Malicious PDF — malware analysis report

Static analysis result for SHA-256 2644dd07146895fe…

MALICIOUS

PDF

129.5 KB Created: 2021-09-02 11:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 141f4a26b4223f7f51a3f66ca330c0ca SHA-1: 3700770c254f3dcd17b28cc2ff0b8c9466e630fc SHA-256: 2644dd07146895fe2a9ef1dac1f10af12e057ad4dee81e89857b69bee1767afe
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm characteristics point towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cesurmakina.com/userfiles/file/63410558935.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097ecc21a9f5---manamexenizalikibesito.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7fdcdf9743cdc5d20e6ef6b30cabf8de/zebadofatijudugotubus.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/95793131107.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3078b7362b2e1f34b5e648e6202e8dfe/57379288837.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/39134418106.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160794acb61d39---93020135982.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/92230715634.pdfIn PDF document text
    • http://sam-global.info/files/file/39113361907.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vinumi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lokerelezakobu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/vobixobozamigekipusuno.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/kilinapute.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672eee17cd---82131574252.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d83ab4d9ff6e7e398e925296f7224889/kubeterel.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rovafisod.pdfIn PDF document text
    • http://altinay-law.com/images/file/wasoxefiwinigumip.pdfIn PDF document text
    • https://aspirans.com/files/file/mulegopenagi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107bc5a2e12d---lulitukatilabifozopuvabe.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9ba1e89559b51591d25142a3cdb25a6e/jonowesataxudazonotemelo.pdfIn PDF document text
    • https://funbugs.ie/files/file/30490666325.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/82612709969.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/31976077010.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/dutimigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=out+of+linePDF 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_off000194f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ad08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD08 20544 bytes
SHA-256: 741bd0e13316cbf47fbb7854597b6f488f116df480869b4cc7711e99b36ff7bb
font_02_sfnt_off0001e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E22C 9900 bytes
SHA-256: cb68e6f8a15084f895f2db01ce1bc710bf97e4ee7c3fee2a15d9363660d85ec1