Malicious PDF — malware analysis report

Static analysis result for SHA-256 313612447dacf4a0…

MALICIOUS

PDF

77.4 KB Created: 2021-08-13 00:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6642773514f765a20fcb64873cf3431a SHA-1: 9d7b41d8d69978074c0a7a4d03099e3d6bf7b6aa SHA-256: 313612447dacf4a008bbcd9f50570be2ef38abe4815ab8830860b61c8ea99e9c
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. These URLs are likely intended to lure users to phishing sites or download further malicious content. The PDF structure and link farm characteristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=circle+the+word+that+comes+first+in+alphabetical+order PDF link annotation
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c7a4121d43096d1d55db3a956fa02475/10059640396.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/97af9b49590a578e6ea5596dc58ecb6a/puvajotukoxusados.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/1925625563.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/51931271348.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d2af9c088---5265310958.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/wilifimototugiwu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/81572a473c3caabc100dfa210d25f46c/sabutaneveneli.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ct5p66k46e3gq1ufmlb6dpjkfp/81879780250.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8c4c2e1d78ad7828e80069a451deca2b/panesatababusepiberewe.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/tewenamabe.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210709_012251.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/87001962622.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5c8b866469883c07b379e993e110f9d6/guxutodunelutol.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/515c420bbaa8e8d41d1ecf347dd15c53/31030568364.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713042242.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.pdfIn PDF document text
    • http://epsilonsigorta.com/files/nisap.pdfIn PDF document text
    • http://skia22.ru/pic/file/ziwuluzatud.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/bosajelarekejuva.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/sepix.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/zetuv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54c363fba2---33601840116.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lubabejixuxid.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 11144 bytes
SHA-256: a4b28bb479cb98f3bf22c6dd6240c81ffde929dfd5c36b4ea9de422fe0054f05
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16980 bytes
SHA-256: 8ee24aa8a7d5b5c2fce4c2bd4160e994d2531210d3a00f1980b41e8028f87db1