Malicious PDF — malware analysis report

Static analysis result for SHA-256 def1827de44d2a9e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 22:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 53e22530318bdc39f022f7b5df30d735 SHA-1: e725ce594b92df15dead02f227019a10efe28a5a SHA-256: def1827de44d2a9ee184d9d4d3c7e2f9dbcf453ca6105bbd0bc99c41d8a01711
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised content management systems or disposable domains. The presence of these links suggests the document is intended to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://ketchas.ru/uplcv?utm_term=epub+to+pdf+converter+software PDF link annotation
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/kovejawezexuzurexafosude.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/38962312385.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/joluxeriputorenuzij.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c25c9c77290d7b29f4a01b9c20e3c71f/92632303330.pdfIn PDF document text
    • http://classtool.info/upload/files/87330485393.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0mhf7djbjsu8draoknl8kvds0/43996753606.pdfIn PDF document text
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/65811112101.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26781254417.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/55525061210.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/16019651312.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142ead7a904b---6293266998.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/betakobuvopavu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/31853577831.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/vizalit.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/80480412992.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/71293062576.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/tazelewekamajafuja.pdfIn PDF document text
    • 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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10852 bytes
SHA-256: 97455c645bd48dd6d8298328720ce493734f5fcbd6e8289192bfde086a7ee7a0
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 17296 bytes
SHA-256: 455f6b1f649126fa3842102c04b56d2c1c40cf8255caf353f4c9ec5080df850e
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1