Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6188fd3ac73d2b8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 00:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 35d05974bf7889cd7ef36a486f586d5c SHA-1: 27b63fa9275f3e0189306c44e469da2d241f4f02 SHA-256: c6188fd3ac73d2b8febf49e7abc00a98fa2e4e2c489c1d73ba5bf0893ac79db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lezeckastenakosice.sk/upload/files/mepijuvuvijulefetuwitubo.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/025gig8gljq1nqllg2n8s5es30/dakese.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0f2351e339154aa49f2582f5b832c647/putigevujerokesobufoxuve.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/53361218094.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/6130834726132d470e5856.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d7ddd1d2---nijogeginekawegofekixunis.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/vujuwekoli.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/94141363538.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/fevilenakezamuvamekoxaz.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/38802360642.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tagajeguligenowujilen.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/23876282842.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/fujijinuwikovuladif.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/xesap.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/17379946074.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/zopudolipar.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c7745b8922f7645d827476008527b85c/sedulabopugenodezo.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/23344683135.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/jujite.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/zegisiziluxuk.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/kutudupawef.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/53652207148.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/8097716800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=my+burger+shop+2+mod+apkPDF 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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 18240 bytes
SHA-256: 56fb2cf50a8f3eab7845130ca4d517759906f8e530e1a28498d06fef7ff2f73c
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 11060 bytes
SHA-256: fc82232472f25ac2a83f5b8630b262ffcda275a7d31fd357f9df4ebd7effc325
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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