Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0949a92011d0f3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 17:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 889ce47346218cd64eb35b5f202d3317 SHA-1: c95217440fe6d09643ffecca2c0636843f021896 SHA-256: 9f0949a92011d0f3f92f0e981150332bfb4582a470edcdd3a43426a6e625b01e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or redirect users to phishing pages. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66f0e8b4d---dabewig.pdf In PDF document text
    • https://floridainvestment.cz/files/file/63457133896.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/10502200967.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/7873284049.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/55954142341.pdfIn PDF document text
    • http://placc.info/up_image/36507909211.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/35743643793.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/51494263779.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/pulefirunulano.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/74171725830.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tidonadinoz.pdfIn PDF document text
    • http://cissi.it/userfiles/files/84125254191.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccfd2e614---vuvilewogaperepa.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/60959696634.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/9902395288.pdfIn PDF document text
    • http://agilesolutions.in/uploads/44201629644.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/95412684558.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/naxapaxivizulijiwopixawi.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kibefujopusujov.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/99280469914.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/54627038447.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/83572842594.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7d89eac9e0632aba81ba3c5c66001ba3/43667489168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mail+content+while+sending+resumePDF 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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 10996 bytes
SHA-256: 08820088aa113d92102484233b6030a20807edcd390217774ac6025ed9b9d9a8
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 17128 bytes
SHA-256: a8212de8eb0f7056846c2ca41b2f5482c2653c97c5cdd1159779d62289dbcfa2