Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c30d291eb987ac…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 14:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c41b3d7a6f67fefebb5766249cec6ece SHA-1: fa970277e76b92f9221de7094a7d285d053a60f6 SHA-256: 15c30d291eb987ac87ebb8cb00ac0f25aeeb748b17207cf3229024bfbefbff53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains, suggesting a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://masterjobintl.com/ckfinder/userfiles/files/10119243104.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h54sl36gatp92pt2b0lci5bm9n/30385027062.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/boxajoxulupamizo.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/gunivadozaza.pdfIn PDF document text
    • http://stylekd.ru/files/67892488702.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/voduxitupezobusu.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/ludonosanadi.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/7044513331.pdfIn PDF document text
    • http://hidropro.hu/upload/66397847836.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/55945923354.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/25672831546.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/lujarataxesafirum.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zufaw.pdfIn PDF document text
    • http://tulga.ru/editor/files/94465324790.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0e0b86a1---97715797516.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/84338524923.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/99875854660.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf7e04c89---zasibajinisebolumuvu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vezazutanijuzi.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/21466320867.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l6so9seldf12n9tl6ekfmq84t9/86714075368.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_115356.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/tetedefezojuroziregul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hoic+for+androidPDF 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_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 17596 bytes
SHA-256: 411a7669843ea23da63b6227f7c95a0732a21db11beec8eb94135385f98a7c98
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 10016 bytes
SHA-256: 18f04036142ced18da21d315776ab093dc429db5b9161c48af77bacc56e767fa

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