Malicious PDF — malware analysis report

Static analysis result for SHA-256 24589909ae97db5e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 17:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4737b4336c546de17e876e371d14ecdc SHA-1: a9036f3793718571b77c561e11f416e675dcaa5b SHA-256: 24589909ae97db5e835b89e67cedca9d3aa12c82346ffab61b7d201cec0009f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=girl+names+starting+with+fe PDF link annotation
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fc96bc07e5067871ba4cb4cdb58da2fc/25521312039.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58456230641.pdfIn PDF document text
    • http://dogable.de/userfiles/file/votiruxezur.pdfIn PDF document text
    • https://luminex.pl/upload/file/wunikit.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b714a7cb---misalewol.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/61295962965.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/68801379527.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/8595564829.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/dorujorater.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/82756141573.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dd28e30a---64551537550.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/6774744464.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ef1211a8a6d3b0d39442ea2fcc64a143/lologuduvajavifedi.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sefagirugabixela.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/jesevoxajade.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/89771969367.pdfIn PDF document text
    • https://majubesar.info/contents//files/80821780352.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/tezavoxunajadobejizaw.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/28524210910.pdfIn PDF document text
    • http://fedoro.ru/upload/file/peralimumipofebanites.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/78287993728.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/75150229818.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31c245f30---83037976879.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6dc4724e025315aab9ad978d28fd8989/1818721288.pdfIn PDF document text
    • http://www.bandungmesin.com/file/dakasifugej.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/bewunimopoxokibilopagadux.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 10668 bytes
SHA-256: 4b6253c77fb75b9197e0a557185c6295b0970bf86356672aec649020cdf3fba1
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16940 bytes
SHA-256: 1cd48dbb69853c9fb746f075180a861cd195201fdf83900fa7073cf1318fd824
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1