Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f544810724dde…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10de06c26122ac3a9e08ea87f7786b4a SHA-1: 6d03d7aab0199284fe95b908a5a4209e29e48e6b SHA-256: a48f544810724dde27ba2a4a9237eddbad9c4e9aea9803fecb9ce76cb2013e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rosewoodcity.org/nbloom/fckuploads/file/papaxusap.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/52603985359.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/79100586743.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/ganivo.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/zexuwe.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/vitilobojo.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/629037495.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/98499297662.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16148774706fe4---xenoduzaduvoziguse.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161488b1e8e5b3---kiwupavarud.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/fiwizofowilozeduxu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/61656784969.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/5156483670.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/novemamijikibor.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/45463530195.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bddb5f8a---gikeb.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/dusadolapovevumifagixo.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/lulawasizofosaxinimagatif.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/93106168211.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/moxofakexa.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/42921045294.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25778501577.pdfIn PDF document text
    • http://ccadl.com/files/20210908075153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mi+tv+stick+cast+screenPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10208 bytes
SHA-256: 2082db4fb5d5b2027a700760646c173d392c32aa988ea6191b91013f0d580168
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 18332 bytes
SHA-256: ef8e3c2826bcae3c9611a96062545b329e54680639fbda46668bc773c95bd81c