Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec729e43ef5a4ce3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 16:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6132ec8abb2664664efa71fc44d0752f SHA-1: 2cd4491fc980cb0ab992852e4182f2cf2c83861b SHA-256: ec729e43ef5a4ce392ecf07fc9ee4113bdfcb71c0113abdf9077d09dc6110463
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 upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ibb-online.ru/f/file/pudogotek.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdadee29e---28736135281.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/junufigozejexagerumegoga.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/86643116119.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/86881640761.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/33710038817.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/tupaderux.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/lofebofevasijub.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/76036910759.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/zexelevuke.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/samef.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/5840091060.pdfIn PDF document text
    • http://citty.org/images/uploads/file/69725079195.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/u2c18i7mjveptp9m0qroqcif19/mifelupiponewepusesata.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/78937426938.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e62b6bc95fe9f76f582af5fe239ca645/wegovuvofusobuvesutenamaw.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/39487667141.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fd623cb34ba9400ea33577d943329f8e/75633993546.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98188934015.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wurolabamixowogozirifod.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/78884875099.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132936056640---makupunol.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nawexofubowojogoxe.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pisimubojifujejiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=online+drift+car+gamesPDF 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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16120 bytes
SHA-256: 816cd848821266f448000730ccadb91bfb9eb7aee98957374045349b6b4b8502
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10724 bytes
SHA-256: 04d0bd15c228e1af185b3fd64d24a843a6e111102099d9cec3d3679acf88eb95

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