Malicious PDF — malware analysis report

Static analysis result for SHA-256 f084e63dac8eccda…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39521ab797e7eebe2cd3edadd3199e5a SHA-1: 2c8aee7aea24eb67b91a444ae6ba88ca5dfba07d SHA-256: f084e63dac8eccda6df9e198d332d17b801f8cdb0688b85e657544dc3daa6be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan indicate a likely intent to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ags-car.60km.com/upload/files/1401207929.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5426eb4c57dacb55f2ebfc3a847830f9/1570963638.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e9b5f180---86836951845.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/40464610046.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/14353028594.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fb15f2f6ce149eb3db3ad6b68afd0564/11512871949.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/51010724648.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30444068968.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/2250755270.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/bikiwaw.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/57864910405.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vawirodozoxoledilebis.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valoxutodebidaweb.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98670638c---pajoketafukedizuxomimuj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d5046e47b59136aa6c1f27ae18ffe71c/babemavunikesofunakudowu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fumisokedu.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/56091270040.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/lamepizabedowogiworazaju.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/79576805070.pdfIn PDF document text
    • http://kccmaul.com/files/files/47368819071.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/texel.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/83768704821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=top+10+populated+countries+2020PDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 10864 bytes
SHA-256: d4e3148c749d4e5d227fdc04ece3e4d1b4ae86e81d4dc57ed96cdf839cb17545
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 17320 bytes
SHA-256: 6fb790fdcd8e421411985fff9aeb6f6aca105ba1ee41724fd5973a4e56e5c944
font_02_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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