Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9444c7ae4906cf…

MALICIOUS

PDF

70.1 KB Created: 2021-10-07 13:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e319b3033f4dfe36875541caa4ec696 SHA-1: 6b9d54368573e1881bbf523048e270fe95ec4b4e SHA-256: 5e9444c7ae4906cf6c83cc8db4c5a2f08833e865592cdf3bbcbb4201b11a3d85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links, a common tactic to disguise malicious content. The numerous external URLs, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=probability+distribution+function+and+cumulative+distribution+function PDF link annotation
    • https://ms02bet.com/contents/files/wexazix.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/75715199487.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/bunetoniduwomorasepunuse.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/zovavowivojakomuvaveli.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wazerutarogatob.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/zeneledubofilutixorixisu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c0f9ab359---87633929381.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/luruzalezol.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkjiihbu84p28ba4dc1efbp27a/4773594177.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f937cca3001ca1d9482f1440e7e1c464/77429563468.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/ramixebulevugije.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/guvejetugepuzu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/43401737155.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/gulejugasijepanubafog.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76582859353.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/85038853768.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/67751299199.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/19e5e33c1c68f02c9763eef1a129b194/11515061633.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1902535807614b708bcc51f.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/nimunudirokifobe.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/luzorenufosovi.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/9334620366.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/xagiwunekak.pdfIn PDF document text
    • http://scsytech.com/upload/files/terexumevupaz.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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 13968 bytes
SHA-256: 0986b1fd7751bb2c7e319ef9c0d3adb2f60b79b17e47ecbc266afb3e81a32c49
font_01_sfnt_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 11060 bytes
SHA-256: 67281429cf29309db463e7b3ebb9e69c1994c6b9eb63e49b04f506dcf94b826f

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