Malicious PDF — malware analysis report

Static analysis result for SHA-256 331ec94197dc8850…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 15:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f20538f48dfda1878c5af4944a81c1d SHA-1: 3c4694ec7230b99739d850039d5cff0596cb83f9 SHA-256: 331ec94197dc8850ac41854ad27e5fc88e5c3c3e77204ba0e6279940530d83aa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various websites, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted applications or visiting malicious sites. No scripts were extracted, but the presence of numerous URLs suggests a phishing or social engineering attack.

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://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdf In PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/dazaxu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090323015070554.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/79075586439.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/nuvavim.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45848770255.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/45427817504.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/piziwozafifedatav.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/41938563014.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/43645167055.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/70001951015.pdfIn PDF document text
    • http://bamor.org/userfiles/file/buxalagajesirafegu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/golekimomukutugazar.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/17443922079.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16e1e38b8---fexegobelidajirivizapuk.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/83864233810.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/30254638125.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573bf80fa5---jamoluxinonusavowewaburej.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/d02e85d1d6823dbc1a69aa7a5e20bd1b/pibekomimefov.pdfIn PDF document text
    • https://projetovm.com/uploads/files/97000706652.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/11400029385.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/676613876e77273fdd907d65841a1509/pavenunipudegilamafojetu.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/kunez.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/guwibasesoxofikusogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=imo+beta+app+download+apkPDF 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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 17160 bytes
SHA-256: f83cfd323ad5b740b9952abdd81dca8c9791499cdd217788c74f589cdf18f302
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 10460 bytes
SHA-256: 12cada8f1bf7fd7e073c26b9a0ad71d7aba81f8be96f88d2ab38abdc4806b8c0

Open this report in the interactive analyzer, or submit your own file for analysis.