Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce736cf46630ad03…

MALICIOUS

PDF

127.6 KB Created: 2021-08-24 05:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 36b1315b5a839b2a56edb5b5c3ee7ab7 SHA-1: e512006692016f3e96badf8bcc783962dd0f3f91 SHA-256: ce736cf46630ad03a1233550df33a05cfc6640b30408f4495ae284199ec33317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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 http://jechtinger-wein.com/jechtingen/files/20449408553.pdf In PDF document text
    • https://sonarmusic.hu/up_image/file/22196241270.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52b1d9027---xowupetudim.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/14178198885.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/14184209343.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9323e11525---laxuwinixoxitutoforarovu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/92824548278.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/vilotiv.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210630034858.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/liwuzabajakumilefe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bd6ca9e3---zodexesafezak.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d83ddcd4---wamizilo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ef161b8a---jobunufiget.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3376f119fa---fojaw.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/msfanskm3fuqj8lvtm4c1iig53/dejeje.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/56977496215.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/28355613120.pdfIn PDF document text
    • https://mollis.rs//files/kelepatukisigukogagarev.pdfIn PDF document text
    • http://peoplefoster.com/pliki/15262186075.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf994dc231---nofimugo.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/taperetakixen.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75c358f27---minodipisazazoluz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/080376ff51d2d0969ac9a2545517ec8f/44598399569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=heating+ventilation+and+air+conditioning+analysis+and+design+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_off00018f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F6C 10964 bytes
SHA-256: d09351519dafe66ae9f2d8f5b5e17ee247b67cd3dc76f59007159f2a588fc9e0
font_01_sfnt_off0001a8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C5 17900 bytes
SHA-256: 37a10665db2024e7c1cf4a304a2ed293fd926a536d8d2092a9d1b18cf851a9a5
font_02_sfnt_off0001d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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