Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cf45c7ea1f481f…

MALICIOUS

PDF

94.1 KB Created: 2021-07-19 18:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a7b46055f70e956c4c526a320e37c25 SHA-1: 5fe1af1451d0b92aa2da172fe8138febb69dbbf8 SHA-256: 43cf45c7ea1f481f873b6447f17189707bfc0b29396616abd7845092223786a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a7d5387a---pegugatad.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6d09b2010---febidifow.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/77880597769.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_3AAA3BC34249BBC1.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/8822bcd8ec769e7c59fe149f01c0b79f/44905886808.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/gozisixineji.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b438c59---84588447114.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/o0ppbvfjcfrvhfkefrmaj12rvf/53265023740.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/sufevadevunubalupinafe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3027afec---bilifalotaxilinedexof.pdfIn PDF document text
    • https://kaimano.it/file/zotobeja.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/06c3ccaaa08cdada9a64af04b9a57ae2/23837109868.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oe36o3003djdebc24n3jhqj2oh/18002153572.pdfIn PDF document text
    • http://skupka23.ru/upload/m/purikixifinufev.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hb4c9137g65v291lvo9k3dpeo3/dofelogodujisijituduzopod.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ah1de59nkgrpnke9cjucji10dk/13836257916.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f125d2894649138c58497d6f68259304/9751815614.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/14360760830.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6e96eaff420984c38ff8f58245d2e5f6/zogafegifiviko.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/ruwenolu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/63929153081.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/heqsp5ju37o4ee5ocj87koe7ne/1096650801.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/54512768651.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kitoti.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69ecc37e---zibimeborotabizebekawiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=another+word+for+arrogantPDF 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_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 10396 bytes
SHA-256: 1d661dbedf67bd760f97b14efae811bf8e9c719eb8ae52eeca01f3cc0b4ead9b
font_02_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 18016 bytes
SHA-256: 20c207cababb77c8167081bdcc3f89fb2d88f2bcc55c3fec363b505c4744cee0