Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a927ec8c243583…

MALICIOUS

PDF

68.5 KB Created: 2021-09-08 02:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 18251570f0d3bf6e560b1fbc25526c52 SHA-1: 38ae6580baf6074df1b159ada005b1c5225e43b6 SHA-256: 78a927ec8c24358329f4c282bc90398635d6f818e5c0ddd1829d56fef19e732d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and the presence of external links suggest it is intended to lure users to malicious sites, likely as a first stage in a broader attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3748

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://oniceh.ru/uplcv?utm_term=maternal+child+health+nursing+books+pdf PDF link annotation
    • https://ipekyolumedya.com/resim_galeri/file/xuwuvazaxozuvelepapi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jenafinugomamimomir.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160872e8806852---kulodobix.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pelikobidemazipoparof.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/18653468642.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/19114344118.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/62045923797.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/5762737287.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/017319102dk9ukpt3bvcklvchj/94672141532.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/gagipikubebesolilelim.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/83126265760.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de5723dd9c7---79437829185.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/teferanaxokiliju.pdfIn PDF document text
    • https://costarica4d.com/contents/files/bujeguwekujasofezipuzuba.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/kadomile.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/belojozujezozixijetuw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1880301580613066ed909e5.pdfIn PDF document text
    • https://tepihtrava.rs//files/kozagotolopetideke.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a6ee69ee---potomixosesemuxideteleke.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/jadadijuzamogutapad.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tosopitifegonikefat.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/26958482913.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a8a0vl8eb4cqoeljanokkopmhf/2173449350.pdfIn PDF document text
    • https://marosme.ro/hirek/file/70579605031.pdfIn 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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 11224 bytes
SHA-256: 84f77eef7be5d38a4026951ad763af83b9c7be94d68483d88073eb9b1e5d3e8c
font_01_sfnt_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16780 bytes
SHA-256: 10e4bcb0b446792bc4217179022b4662062405bdbc5d4d262b981a61e91a0e2c
font_02_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1