Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4c0645dabc4dd5…

MALICIOUS

PDF

91.0 KB Created: 2021-07-16 08:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb289f055ad9c8e26f0b6c3a044922b7 SHA-1: f4370ae199feab4a53054c2aeb8fdd322d4eb73a SHA-256: aa4c0645dabc4dd5fd2c44c567566c02b7e576eba5e4f25ca99b22ed4d39040d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=emphatic+sentence+structure PDF link annotation
    • https://avistravel.ro/userfiles/file/tawubawetupewasumedazuzow.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfded7e456a---36248798828.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/56fa6dd71c604128a80fa75a534d1280/84222390184.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/96004676736.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/puwunevem.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9bb38b5b8bbe81080e7522d7d10fda84/sikigenifubivup.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b22282c8968---48806146939.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ed774b8c---febirixopij.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f3fdbb92f---devomaju.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2371d492---dasamomipexub.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/m7niiglm37ongcnu71kghpof47/48296423038.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/18674070259.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c578686de892722400b6f99dafa0ba3e/tenetojaravijilukuvuk.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/xuredojax.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/150d81bd47d6beb870c8fb163b539ee9/39963056006.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75f4c59cb---jajudalozotinobe.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ffc8f117---nanevujuxepigasapavilalad.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/3186242940.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/52992161656.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/56da1a4366fa1fd95c56bc276d9c8f80/23559368826.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pegevibavigo.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/56435843993.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/mumojelame.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vuxufuxesulo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/16853663579.pdfIn PDF document text
    • 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_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 17604 bytes
SHA-256: d5fd2c48624a5d01171ab92a2152073629998be135d7bf499723eb631fe46667
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 10556 bytes
SHA-256: 58ae3db582594852243c6c938933feb846564c7f437ba827a13fb644f7703fae

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