Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6763051f4da2f4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 22:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5e94098323c0fae15106c1b2545f53 SHA-1: a6d2c7c8cb524384f84165fd01543fae08075122 SHA-256: 0a6763051f4da2f401d43a7ace15eba5a5a81249bbf3939ceb53ef1d728ef18f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a high likelihood of malicious intent, possibly involving JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://proetcontra.hu/userfiles/file/rivuxija.pdf In PDF document text
    • http://galsabino.it/userfiles/files/widuziladurumunoxuke.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rrdfc3db6ot20c468qvd1q87s9/ximikebujive.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908225456.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/10780273681.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614257ff141ba---nijibefot.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/97979390922.pdfIn PDF document text
    • http://unseretochter.com/images/file/14291694864.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1sk86vq2glnkh3eqb6vc0g3nr3/41738201855.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/katizerelofotimexalupow.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/32706625066.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259c68e0a7---komugowi.pdfIn PDF document text
    • http://yuha.be/_files/file/jozuzuwexiwamog.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614418ff78272---pesinus.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/12458386769.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41415033716.pdfIn PDF document text
    • http://jfe.hk/userfiles/vujaziperazikikul.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/45509915363.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/jopifufumikiwefejolej.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/86960477660.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/lipovidu.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/jurezubaxalemigidew.pdfIn PDF document text
    • https://atlantidegattico.it/file/7226899230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=integral+calculus+by+schaum+series+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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 14352 bytes
SHA-256: fe3e2ccb3c621d3761736a025727906cb70728c821b67b09ab55e7c44421a416
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 11252 bytes
SHA-256: e2cb99284873c43cb6d8c008f2bd295d4f379c3f31790cf8db84f04985ccbce5

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