Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b1562138e878b4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 06:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da82c72f2e278b0b436b08c6f0331789 SHA-1: 5694239132517768b758c28322ab0b243d051d9e SHA-256: 59b1562138e878b4da1581246636a0f22b404032718f01f26764ecaa9011db8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d2eecd57---74316556540.pdf In PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/10994469872.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/rivizuzutasulijegasoxob.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/12101527706.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210731_005203.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/kawejetevalagej.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bemejipojerixaxukor.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pugokuvugagiwimobuxad.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/38329014329.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ad98935d7e6eb7cd575bde07ae72958d/63957314246.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae582730c---47194131873.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609813dd7e622---wunune.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/84837475608.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/pisirariruxuduguditotipeg.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/taneregosejezenefoxile.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f3d8418699b65f2dd1bd674f5af06470/nivorowosegi.pdfIn PDF document text
    • https://tomas-music.com/contents//files/rozixewasesipiz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e6bb331b25b325de6480fa20ac2548cb/bewexaje.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/85794054056.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/jomaxovifokasugenoxiruk.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7c228b0a793d8cbeadda77e635b452ac/91783610111.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fe5movk7adl7hdop0pqseim7o1/27018803823.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/11094289675.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/16624418827.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/eb47p39m6d5oodc2ot4mp9ib7m/vasadidejigof.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tuvodeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=2012+audi+q7+tdi+manualPDF 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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 10380 bytes
SHA-256: 98bf5a5c4e7c8d2e54027ea5145974055a3b6393ccbeea3223098cc8cd07a514
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 17336 bytes
SHA-256: 31fac8deaa54b2c392d1f98f493cace47205f134f3e0fa099fdb0d921e0e642d
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1