Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6047ebe74fe4ff8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 12:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bacbce1fd4a96180beaa28942396bc01 SHA-1: ba97930a93e07ebdaca87170060d9d38e99ddf90 SHA-256: f6047ebe74fe4ff8e8cf49d8593e78b4e628b8c8dc258412aed66f71ffa08393
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous PDF links and the use of disposable hosting further support its role in distributing malicious content or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/60749114874.pdf In PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/15836472207.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/ruwab.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109140435456942.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lalezuz.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/34164846684.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/19847423633.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/nuxepivi.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/xujuji.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/gifaderisataxoniluw.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/73268410146.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/faeafb47982e1b82a73e90fb347d4d97/gubogazilizojev.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/vesikos.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132254843329---78628960680.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cc4fb18e8df4740f70845b9dbaf55acf/zofovewijiwomokisetumex.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210917_7952CD9459DBB3AB.pdfIn PDF document text
    • http://knipia.com/userfiles/file/50087337628.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97f4a4e72---27957309638.pdfIn PDF document text
    • http://ellev.fr/upload/files/samiwekubudejoti.pdfIn PDF document text
    • https://qkon.ca/images/file/5686232106.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/sekujadifamawovo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fapevodizuxoderizodowoz.pdfIn PDF document text
    • https://norservis.com/files/files/fobobivelofuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=transfer+android+apps+to+laptopPDF 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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10452 bytes
SHA-256: 9e98f74ba34ef9319f64424baa81c6a7a89e6fddf1868d49a2ca9091a29c8f81
font_02_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 17216 bytes
SHA-256: caa45d3d62affa2fa4f233e775844e0be0c484a68bcb2b1334d2700231ea1e14

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