Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1e074d3efb9708…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 11:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f49309404ee3637eda31df9eb9ce9acb SHA-1: e1040c044801a43b31cfb2f7fd14f4151b5d459a SHA-256: 4c1e074d3efb97086b248e11562e4a73c6ffbe8807bb2807c0a5ed04941373ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=barracoon+zora+neale+hurston+pdf PDF link annotation
    • http://bainihu.com/upfiles/editor/files/taleko.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/68904409711.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/62782008388.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/satakediropofizuxojadizon.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91233149034.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/fe51b53a357ad2d3ce7579e2b305c836/golubezovas.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/feborovoxinepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddeb57743---gikuwivenigis.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/jafesokevanafolotula.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/21332079597.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c911449f05a---mopobexemekoxonoxow.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/df0qdov9bpgjmqeda6q9aj1em8/rubagepuf.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d12bf0218e212652bb5a8ee019b5c887/faxopijised.pdfIn PDF document text
    • https://dintek.eu/uploads/file/96071340470.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/13859998681.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/13899350287.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/9126874432.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/vazebojixolijiveg.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/96637879915.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/hsm34fdvuvtjc58e1ghuo7rhof/vasoseluvakuzezadop.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/54064743064.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/54064c3adf58258450289dcc229901ef/46781560248.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082229c330b7---39441415626.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/16938721105.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/57d22080be8516eba2f6bc0017ea9048/5982871462.pdfIn PDF document text
    • 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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 17932 bytes
SHA-256: af78b491211bc6a0161353f33cf15b5ca7b578448c3e2fbbc6861a462bd8602f
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 10840 bytes
SHA-256: 3079622ee201142508fd4d60df22ddd40da448a7b3c66cc4224d70f2fb5231cd

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