Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca609436a49d4360…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 212b8a2b669508bb5503ba5f9fef5d8b SHA-1: fc40e0e0e8e2e84f2fd13d36aaabe317e30ec9f6 SHA-256: ca609436a49d43606c38f9c55b49d5b93d9ad4b7620e377e0a3e602e118a4815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gionggiacam.com/ckfinder/userfiles/files/tasudidazik.pdf In PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219765578147.pdfIn PDF document text
    • http://hanleyresources.com/images/63737073492.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/79585903863.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jadanajakufesilej.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/kutipolerowopobezen.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/tiwusoboxebovojewa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139377e56d74---sifijonabugu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/zesewewuxuturagiloxapita.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/zaxudixux.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19769204877.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/93bf14612ce2450b9ad6b9d66e527442/98186949378.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/xifitijuwulominegabapi.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/mabako.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/zejimi.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/demozekugebikogi.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/50328112296.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/61929719271.pdfIn PDF document text
    • https://stopserv.ru/files/file/vinutonovifope.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195629556263.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/19515773715.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/vofejojodiraxexowag.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/92084681619.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d30cbfe5---96446237760.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/49249883843.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/mejorelikinupakinomufafo.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/98746548562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+lock+gallery+album+in+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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 17592 bytes
SHA-256: 70e93caa9863bd2e5ca8783ef3a25e15d84abe56450376249566086ee30fdfc9
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 11068 bytes
SHA-256: 0169054a50b23c5b028df4b960a347e0e9b3cb374d4f1908fb540221a1a4e77c
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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