Malicious PDF — malware analysis report

Static analysis result for SHA-256 644406252eeb0fae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 16:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d59983ba29a8a1e0bad33c3b8a9a0a1 SHA-1: 2b9b9c537c5c7bcfc4c5c01696a130017ecb760a SHA-256: 644406252eeb0fae31994e9b3dd35533b72371bc64412176e490bab9f79c9cc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 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 https://minervatech.work/js/ckfinder/userfiles/files/17109286117.pdf In PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/kisanigeraxozudixakulowi.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/42530703520.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/36303637245.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5952a38209---71174197997.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/31853010555.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/bisajerodi.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/3742192067.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/67398814718.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f16d7b213---40968497410.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/mavuzumotozewazalodekub.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/maropamuwubobikuremi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b412b19c2---87097993746.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/nigujobobobuk.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8ac4abb62---62969372953.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/89809416868.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/dowukozup.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/fuwopebofezoxonitobalud.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/notoramozotufi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/69555388029.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v41e59vjvcvp496a86u32f2f1q/tidokozilililewakikula.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sikevuvit.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/973145b9f0893a1bea8414181218c37d/34054164083.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd796b0f6d---3830622756.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8fe64c05b49ea772a1f0432f6f40c1bd/peroroful.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/b95e78kugp68q12t9k8a9p9ist/wowizekexutirodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=12th+botany+practical+pdfPDF 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_off0000cc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2E 18912 bytes
SHA-256: 6205f079c62ec742cdbd40383cb36148af7914178f9cf0abc1b1f4b265cc0cb8
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 10748 bytes
SHA-256: acbc414f0b6a84e60c323f608625cd09678605175da5547c6606715e7056e6e8