Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4d0d42d753da2c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 11:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e69a6c30914c7051c3d5431aa398f8eb SHA-1: 12da14d2df89a14f2e4fd36f6af23dcfd60c8e05 SHA-256: fe4d0d42d753da2c9fabc6047434d2d98b3a0bb6df3d2214385b714d61037218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=powers+of+10+and+exponents+5th+grade+pdf PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16120c3e9b7ad2---dawubupofulakufapajodim.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47de642524---repidavowezazitoma.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160806f2574e9c---48235129776.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/22289548680.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/31578052527.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/be301373b8e8e59a2b5214a1a2cf098c/vajuxupezejilexu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qn8fe81pbmmgf98jd2so8s6mi2/niwonowevamakawekaxewop.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/fazafefetaluvamobamuxaror.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eff46d8dcdcbe1d6f72a251629b419d8/24193147581.pdfIn PDF document text
    • https://luminex.pl/upload/file/rabozutelajoxebotuw.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/42537100604.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/deruririwobosemojekib.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/19b5b38a1529573ac4b8b2b7faa5c46e/71552183684.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/19187234093.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7d1e6a0b851a6a0c310f67f88df23d39/lovowexilaku.pdfIn PDF document text
    • http://gistys.com/userfiles/file/kuletovekozobeferujubo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/paguxow.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9265fc8a---gavilotavamuposizuvobevuw.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/53760784945.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/liveminijemuwopa.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/83832450758.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c826fe20d4ad75ced80fe5b0c7162ef2/25105812801.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae0c4295f---20569993511.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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 17412 bytes
SHA-256: 2178127028fb78aff1ea0b0d72a46880fa748ac38ae8351a2f8b5f96f08321e2
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 11136 bytes
SHA-256: a9c243bde44042531e9bd56bbf220af94b2cdd945636f5d68d8a9a368fc4d823

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