Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1c49802715b94a…

MALICIOUS

PDF

83.3 KB Created: 2021-07-10 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 01495dacfbad4b9efe580caf9dca702e SHA-1: 3f99f9511b4f18bd71a0fbccbd17ea91a63f7c7e SHA-256: 2d1c49802715b94a010cef8b3f1b50183715b5fe3785f0fb6335da68a03eda8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and using URL parameters indicative of a link farm. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609612a66bb5d---niwajedijo.pdf In PDF document text
    • http://chicohigh1987.com/clients/47015/File/73004486290.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f85218ac---pijanuxo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c016cf8f958---31536468108.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7d44c132f351968db78916f0528f7243/63600127274.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/aunv0f201eduj23f4m8m0gudns/relijodikiwabeselazozig.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/minuwozapavabinafosofapan.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///ranonerawa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/idokajejoxanomupi.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/dafudixalokosizaxofuxunu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/18182157548.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wirewujal.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/fidoxawisinanesiwebaxusob.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a65906337d0a740d7fbfb2e8430f2015/fosexuvoxizoxikek.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/718a2410d222486b546b3167b63b236d/49916502023.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/32854122366.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/fojamamaxeduxat.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/ledab.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94af00b4f---pebip.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/558ea9887e237d54708fd649b406c547/mitonagiseme.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/aae62593f282fd7b8c3f043fa5df7138/5460822393.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f67ffe17a618bc5415c61e0ad566608f/39375478479.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/fefufutimilaponigogudu.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wusuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=science+and+technology+winners+publications+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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 11416 bytes
SHA-256: c7cfb8c334ac5e6d14fdf88b55603c82d25a0706a79e4eb3092b65593fbf4ba5
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16252 bytes
SHA-256: 4116ad33a7a489fcda811d40eea10f915695935bfe5702f917938e009a4fc61c

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