Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7afcf7c209b64a…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 08:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce272d9db94a678f65b1f87abe00cc28 SHA-1: 8783434c58e33b4c7b15ebb6b00c51547a770aeb SHA-256: 7b7afcf7c209b64a3e30a9b07e794b586d452902c42c08daf8af167e23e3c0af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://evergreencans.com/userfiles/file/88561013755.pdf In PDF document text
    • https://ferropula.hr/files/37091214160.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957ac9cbb43---pesabixejesumo.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tepekiveditojenojuwu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6070ce290---64112050238.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3fff8929ddf17ecae177c2ea73f79b3b/bawupodikizeninowokur.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/68934129469.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/lonagadexajifamowaw.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kakoliforamamofaba.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6346c636---gesikemi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/5932320844.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/76886268179.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/53644056356.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/61493182872.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/70882744929.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/777bdc1b9b86c27feaf6696e1bd6e4a9/kulokeponubi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/dmh481bvgfcp36h0dafnts0qhh/77361330756.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/karuraxezawunusoromenoguk.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/43592230969.pdfIn PDF document text
    • http://bscartridge.com/pic/bobafowotizunuxag.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20964b24d---tenukuzupep.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60D84B6717590.pdfIn PDF document text
    • http://sro52.ru/uploads/files/navamokaloneji.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/385ad885bf13e7c2b71f84693c224cd4/pofedipoxikigepofafabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chapter+6+review+chemical+bondingPDF 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_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 19464 bytes
SHA-256: 3f3d68e155ae455e58533febc0c106f3b26b008e3efe0f016a3d28b4828cab98
font_01_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 11284 bytes
SHA-256: afdd5da6ca1bab6ddd0cd2869e6e8967af89eef3661dd2cf0c742c83e76970a1
font_02_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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