Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5261d87db19d8d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 14:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec2273f59aae0b3a3f08518c94111352 SHA-1: 0bd0f000e34d0287e043cef5e509f22c3b9add90 SHA-256: fc5261d87db19d8de98de918f89c9bec37ac05ed17005d6feb371ee463c30730
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to various websites, including compromised CMS uploads. This suggests the document is designed to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cesishotel.lv/res/wysiwyg/file/tilozasovikukog.pdf In PDF document text
    • http://odessawa.com/userfiles/file/sajidiwowo.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/lofezifarulifizimilatuga.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/83563995689.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/91640794936.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4899d896---14702741177.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/12990160354.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/20417913.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/mifinanasimoselakis.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/95330408173.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/33155195495.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/75102460969.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/54608088605.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/6397545391.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/36358315505.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/nawepol.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/85665261522.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ae657d6---sireg.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613745cbd12fa---zojowutaselajizunip.pdfIn PDF document text
    • https://onlinendttraining.com/files/xoretifafepaxitipuwumutus.pdfIn PDF document text
    • https://iwistw.com/upload/files/12851518759.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/42689491405.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/tagabilaboxo.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/17784210352.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/54529088164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=when+you+were+young+lyrics+adelePDF 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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10844 bytes
SHA-256: b82774c6cd31ff0c441e48a1d54db11f3e06be3150c6d19697833d050877489b
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18140 bytes
SHA-256: b1eac4fb63fbcb7c50e8e214f36d4596188e7f362c0bac8912fde035ea247623
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1