Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1a87491f61382…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 06:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 466193d4b2a089a428a0d31aa135dfb5 SHA-1: 3ce0db00286d9fa49b24d64daf9224a79fc53de9 SHA-256: a6c1a87491f6138200ff0ca8aef66558af922d95fb39b20f9c25ba457c7039d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=what+are+the+income+limits+for+snap PDF link annotation
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/modikaponuxulikuvo.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/82443412300.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625729080.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/sijeluminopezotejigisovuw.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40c2d6ae1---tudivukixabeler.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddf33eb5a---38590653524.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/rijafa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bbdbc4274---tujiraguwog.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/piradizu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c803ddd76b---98329683197.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/warej.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/xepufesogavov.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4be711b8e---38069036659.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/domagexeduturerigalobimav.pdfIn PDF document text
    • https://slide-bearing.com/d/files/febotajuzosufo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5a14a5ed---zanuriwepiwur.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetufuwotozi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040614332825.pdfIn PDF document text
    • http://katachizu.com/img/news/files/10577963770.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/zofixatezega.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/26478046546.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/309fd7af709f2aeb4834a927a21d9c44/lipara.pdfIn PDF document text
    • 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_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 17760 bytes
SHA-256: ed308da1e5257d4486d64c5ede2bfc36550f40b22021727400b0637aee6c9db8
font_01_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 10736 bytes
SHA-256: d128f554e9ee638f5857df7182922f5cb90bbef8fe476098a57c86be4ad2ea43

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