Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4937409aacb407e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85fbb83f00df9887fd54a24d7890da65 SHA-1: 964c365452c2e5c89644a8c1c0d76e09061852b1 SHA-256: d4937409aacb407e8368d6342cfe62a474409893946c150b6e1b0db872aa9769
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a large number of external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript (T1059.007) and the nature of the URLs suggest a phishing attempt via a malicious attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=safaripark+beekse+bergen+plattegrond+pdf PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8866e34b---67021036246.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cde3b585dc046f9564ede6a3a4ff96b9/wemubopivivixiritopij.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162921290621763332042.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/gunoxabemut.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c85181b8e04349cee24ded0bccc86b24/kifijamovalexuriguzeg.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210813_68E947F68560BB4A.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbb644d35---51298430641.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3aa2a9fd9d4152d24c8721e6050ff569/gijifudul.pdfIn PDF document text
    • http://secretinvitation.net/images/files/45036849887.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kobukixefuwimafu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16089513f2c781---lufedameve.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5777d4bd2f---4978863707.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xoraxesuvituwoke.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ce455e9948ef9de3a6104006afcdbf83/fezazitogu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d2b93292---vemodozenoxojubunavufo.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/82923230586.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/bc8e7fb8a98881d99ef6c051fcc1741c/74189669139.pdfIn PDF document text
    • https://fuoriscena.eu/file/26642452996.pdfIn PDF document text
    • https://rintrans.com/files/69742664088.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wulojisunusi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i0cc6iite7lc1bqn7dbcs80i52/32976260317.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbecc4f10f5---lefunazixenekodubabazi.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/29445536916.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_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 18248 bytes
SHA-256: 4f0f5d07ae282d5f35db28fc1b27f33376fd82eb7080f318ff3306c1fdf322a1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10980 bytes
SHA-256: 1548ed9b4afd861519c6666b42041b48c4b9e5dc8cb283327e3b8b744c4969a1

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