Malicious PDF — malware analysis report

Static analysis result for SHA-256 634ef693a3b58b8f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 05:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dc9795f66abc6eed49464d4858f4bce SHA-1: 563bf3638b7c8d705902a33f69c385987df84ec2 SHA-256: 634ef693a3b58b8f16c5861022fff96703f176b361fe617c9b43d1ec4e99265d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers strongly flag this file as a malicious phishing trojan. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coffee33.ru/archive/file/dolazunipu.pdf In PDF document text
    • http://msmzizkov.cz/data/dokumenty/49736642119.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kogujofinozokivubufopag.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908180719370786eou6etur1jvy.pdfIn PDF document text
    • http://saktigroup.in/uploads/safaferavefe.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/42247056909.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wuzivotof.pdfIn PDF document text
    • http://yanartextil.com/firma/files/17507466440.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77668331450.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/mulaf.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/31558252947.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a71cf2e---84258796314.pdfIn PDF document text
    • https://mimpishio.com/contents/files/14285529782.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/30734956086.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/22407565502.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cbf94268adbcb8deea0f22c213ec658d/46132138883.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363cbfa8511---61013705887.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/wixojamiwozifi.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pakozifefudivibujiwud.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/kekowuxi.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/vexixawe.pdfIn PDF document text
    • http://denge.aero/upload/files/bapagabar.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jobawujupexofivegifit.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1091e9b8---fodipuritaketo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1+trillion+rupees+in+croresPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 20796 bytes
SHA-256: a0d59ca3913396e8aeabe35811f77cfcb2bf23996fc3830e8a3ca43627a3b18b
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 10260 bytes
SHA-256: 8671c69324729b5bac71a5d01b33ab086e7bd3582b295a2b1e59bdb53e6c92d4

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