Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15d1376d4aad705…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 06:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13ef721d3cce3f4b1de01be19bcb82de SHA-1: 48d98da428e8ea1f10d3ac5664a44840025ef108 SHA-256: d15d1376d4aad7052d402c8c770bb588a7b3b072b8d329d4bd036617d8b31508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://ttccid.com/userfiles/files/66837774081.pdf In PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37738930359.pdfIn PDF document text
    • https://citronel.com/userfiles/files/65168264883.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/65961669482.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c332629c---29324120829.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/66858058564.pdfIn PDF document text
    • https://produse-zilan.ro/files/xekebidofuve.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/momujezuzutozimo.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210929042407.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161306d914849c---23121748007.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/99510379502.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/29a3d33969e59de2234b304d6b1e5b3b/kigavobudabemifoki.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vigabazabapamigari.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/51791949290.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kipaxozogexukej.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zapojatevurazajinud.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/53274856309.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/fusilukafuzixo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0c77509b559ae838f8392f4ccb4fd26c/nijiw.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/4794600787.pdfIn PDF document text
    • http://hydrem.ru/images/file/mejujobexiz.pdfIn PDF document text
    • https://socardan.com/userfiles/files/34959501666.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/nadirufobategumabegarev.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zokajinibiwudaki.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/newupulawexetadena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+house+on+mango+street+book+reviewPDF 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_off0000b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 10956 bytes
SHA-256: dd17cd279c3b0d4e7583dc8e9b192366bac3318ca265d08ea8bd85c769aea149
font_02_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 18272 bytes
SHA-256: 6472de19cb928ee5cca6bc16be55bd9379e79583cd21d3515d79d51a7462350c

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