Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83fa42acc86873f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 11:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58060a3e90fcd29fe97bfb6c5e2edae8 SHA-1: be897e9d240294e76aeb03fdd590e6afb83a8ad7 SHA-256: e83fa42acc86873f2790968d7cceef117b2fc5400498e3a82fad1ab93f104f69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccceb5eed---61863789594.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a07aff77f8a---badeteguxakefujumasoko.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/8957636326.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e80aebcd---90910623082.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92615826592.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/14407336553.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/553e81867b926e47458c22d47a19da68/malulobedutanufowutuso.pdfIn PDF document text
    • https://best-label.com/upload/files/zofuradiporobu.pdfIn PDF document text
    • http://malifer.hu/upload/file/rekutejugig.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/7567508490.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307497d0d89---vanet.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ed2ri7vg1hgsj6vcaojv46k9h5/sugaxisujewu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6bb22bf2b5a8dcadee1f3d9313479208/nosojorelaxigate.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/75565273689.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tazawudegodukexadex.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4563cd1a6---91532843505.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f4561a3e---22744411481.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/woxar.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xaginogagib.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/418e09126149d456b1d8777040d7f531/zividezajegirel.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c7b1a8238ae332360014fd0065b18aab/17432025650.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076953115ca1---50383039163.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/mixusokagomagimiv.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/14485865738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=finding+empirical+and+molecular+formula+worksheetPDF 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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 17440 bytes
SHA-256: c189b56e3a9f7834f7080d1a014bf03564dc791961e570d268c73cb8c0e488d8
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 11324 bytes
SHA-256: f591a4713d34af529c95aba3076ac94a7abea12d2d2b97db3056535e363015f2