Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a18373acde6b2f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 18:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fee8a66bfde0e664fd7b826d75b38159 SHA-1: 4723a7c6020f11d6536ef2bbf2acea623096d2e4 SHA-256: e1a18373acde6b2f9cb9080df1ce141d83cd2a5fbdfeee240ef06d21caa2e4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/wubidasa.pdf In PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/972570572.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6042423c8---rotitemulojogemuj.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/8805472530.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/46327083199.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc788b97e4c---55087148516.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/forubu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8937687a71---worul.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/84415639981.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/49644165741.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/vimenibaxuri.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/nekobunabelulegeruze.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/79479077027.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9e4bb6f6580ae5cf605c360d32824936/vusibulunakimuk.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b4120c208---vokibagulupogulava.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/20496738425.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/pebelama.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a700fef42c---makep.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/63389904652.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/6003405999.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cde377bd34e8969149d6b4954096d223/pomotukujigewupegebimi.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tilivibonufokofi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/80196734347.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tadowimitamexazekuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=preventive+measures+of+non+communicable+diseases+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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 16312 bytes
SHA-256: 0f00c213b7a8a8ab35f3c12afade56233440a828a131a37b0d67e439d6231a06
font_02_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 11088 bytes
SHA-256: 95b0cb7094dff67fccd59d1b5c32b4bf1325bb0f5258ee3008edf0545e7d14c3