Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f997f0cda84268f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 10:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69a5af5b59d01fd8ed73b2584e1bf1f7 SHA-1: e9fcc96cd3d7c120b5e2965e0fe3d8ff79177585 SHA-256: 5f997f0cda84268f5e557fd35557b11f9284acbd9a7b8175498c5b5c82a21e04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the presence of embedded JavaScript and that the document functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting. These links likely serve as a lure to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjl522p9l9bjge3m6qma74ukah/24551057829.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3e5ae012e2cab92735400c2d77d1db4c/tasopofukuvitakabulifo.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/43832588762.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/fonasidonemakatuduvogi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/94d38cd1fb0a31d8cfb050d4fea5ca09/bapot.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/75223223685.pdfIn PDF document text
    • http://www.77ice.com/upload/files/kasogewewedezo.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/womim.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/29064751392.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/pawutidomesawefetilif.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c2c97f49---49021085063.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/tanojudokit.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109012159001683.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/mebafedija.pdfIn PDF document text
    • https://network-italia.it/file/wamusubovigonafomufuz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/9608769117.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/50435428623.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dc910d8141322508bb1d2b5a03fd51b4/zezaje.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/togep.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/mupibera.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/9682338010.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/58413432540.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sefixonodozutofozorol.pdfIn PDF document text
    • https://birotex.rs/images/files/jasulirosuku.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=real+steel+apk+hackPDF 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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 17888 bytes
SHA-256: 06e067a6fa09c8c3c25e6b374775f5297538990af6cbc9f57bfd9851376473f0
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10192 bytes
SHA-256: fb49102310f0c075bdc9cf672cc4f3f1da1a600309fdf369d8a951172de545d5

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