Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0e456bfd8998aa…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 01:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25d7cb01cb7c3705446e5778b7c6fedc SHA-1: f1cb2106da54fe8b09610ef1ea3c67481b2a1278 SHA-256: cf0e456bfd8998aaeaaf9ddf01f05138ef0eb452ab0178828f5d300f9662578a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://saipanbooking.com/FileData/ckfinder/files/20210904_E4853B413CA8CABD.pdf
    • http://balletpanov.com/uploads/files/rusafunorosodek.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/63566261555.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1d044863---87637097999.pdf
    • http://studiolorenzoni.eu/userfiles/files/ritaso.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c302cee0c---betakulukojogezotivaw.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a071f198---kexiwadetonini.pdf
    • http://abc-tel.ru/data/File/dujofemoxupujep.pdf
    • https://hotnewsmd.deca.md/upload/userfiles/files/kuzikenozite.pdf
    • https://windscrm.net/files/file/gexunelikonu.pdf
    • http://inannamsao.com/uploads/files/xasusiganufane.pdf
    • https://medius.sk/userfiles/file/99298425086.pdf
    • http://eltdb.com/UserFiles/files/16663885081.pdf
    • http://baigeleather.com/userfiles/file/4973019204.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/89358533507.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16192269979.pdf
    • https://absoluteanytime.com/media_file/files/files/dumitemiwozam.pdf
    • https://jackyrouxmethode.com/userfiles/file/lokuwatelebuzar.pdf
    • http://nadiadsa.org/userfiles/file/zibezo.pdf
    • http://wingmanresearch.com/userfiles/files/pugulobasabolog.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bd35165b5a9b0e778d9bcfc9c1bd71a3/lipofevawelarevakifirireg.pdf
    • http://hondatayho.top/img-ngocbao/files/relipafebevedikiba.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/xejukeroxivamajamis.pdf
    • http://www.flamanville-76.fr/upload/file/kifigakozu.pdf
    • https://xn--nmqu14inmf.com/upload/files/mutinot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=create+app+for+android+on+visual+studio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b886.bin
22beddf6f2dfd45e4fbed4857920af191bcd9d614985ec5b5b9343778dd9e62c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 16244 bytes
font_01_sfnt_off0000e25f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
font_02_sfnt_off0000fa76.bin
55e82f94c5e1ba9e4755f877faac183b9a8026a01c927a1cfccbd2675d5d3cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10688 bytes