Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b092767855b6c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 23:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cb17acda717229306fe72503fa10b92 SHA-1: f8055299f35299d9124ae81714367fbf05b9de75 SHA-256: 7f4b092767855b6c1a677038aec985ec65d72d1f11842c162c3687a1bbc28806
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wildpflanzen-planung.de/file/nerasusin.pdf In PDF document text
    • http://nova-auto.com/upload/vebiraxabikabipigikef.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/67282105706.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e11920d0849dfd1ea1839ed61a6b3bef/gamewabobusinusem.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/46719470554.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/wutibapiji.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17798821144.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/91353868827.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/47549401795.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1214a18da23b1ed29ec5ad918e2e76ae/wufudazepagasis.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/bugufewibimegikupukup.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/navuwog.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/12574788747.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/luxep.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3987ad311---vitimexoxor.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/90024709015.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67747682328.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/katuze.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pikusabojuzi.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/11945550116.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/32067791270.pdfIn PDF document text
    • http://taxfreepoint.com/file/zugorisa.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/xusiliwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=8+ball+pool+happymodPDF 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10328 bytes
SHA-256: dad9931e7fdf721fbca9df7735d250fd0c7a560368865c3227850dd7a41e582d
font_02_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 17492 bytes
SHA-256: 90685417a6014076e6e3edd94952b43089920f6ac92480aae86cc60815dbebd1