Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d5fb8cc7f7eb0a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b715e3222cd93ad51517617ece38897 SHA-1: 41d49cb7705b21c10817ac557b356efb1ea12343 SHA-256: f9d5fb8cc7f7eb0adcab411128362c114b8e03d8505c07907be53b52725bc8fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://flambotour.it/themes/userfiles//files/29786972841.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/213eb4e8ca788700cac1e3744edba939/53464924617.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/68780127415.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15c1cabed---fakimosudotokij.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/88137721523.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b0db9488---lefikegimodukopuzosuzatum.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c76ef962d1dd61669995442b30c7aa2d/vinagibogexusuz.pdfIn PDF document text
    • https://5udua.com/contents//files/35293913330.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lujozafewugutuj.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/binikutapovijadafaxoga.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9e34815a---kotopefowa.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/9541035601.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/097a478fe96fedc95c9acde2f1b17792/55199064351.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/muridemas.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/tanesimasima.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vs4j13a7rp18kig5bqdhj6sbu7/53356948049.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/02bd101566a1bd0523135d119eef793b/lujisiwuboter.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pv19ssv8p5rr0bi522adi5gq94/girunosoxunerixabavuram.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d472901800---rubemires.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sakenazeru.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/26625593923.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/8350318970.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/purevos.pdfIn PDF document text
    • https://masukpt1.com/contents//files/jupaza.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210823155056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nmat+philippines+syllabus+2019+pdfPDF 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_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 16728 bytes
SHA-256: e5d7f0d20b20f728ceed2fc5ff37862c2ec5858a62418d842084b7ca7a01f755
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 11336 bytes
SHA-256: e50e4d2b72e2996605b658635bac2d56f90143f8bb3f239181336dab32d67022
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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