Malicious PDF — malware analysis report

Static analysis result for SHA-256 745edd38b24ed522…

MALICIOUS

PDF

69.9 KB Created: 2021-09-05 14:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f337f8cf63bb8e8da5c754ae89ba9502 SHA-1: a1615292e21783496666c15b7b5ce4a0bc960b4a SHA-256: 745edd38b24ed522f33fc09548f3ce134cf3b63bfe4a2141de226c0b6f8cfdbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress uploads or disposable hosting, suggesting an attempt to lure users to malicious or deceptive content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://the100voicesofgospel.de/fichiers/newsletter/file/21272897207.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160988632a9f09---43197175814.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/46858650933.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1733b76388---77927537286.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/davalevopi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/didakibovezogebekixaze.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/27463396466.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ff74f1161ebdeec801588dd009c3ce2a/visoduvozegekirimefub.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aoqhi8r4fosm9mndhvk7a7uc66/93863221774.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/zitidemebisanufak.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/2147aa56864411948761b0e77ce0998d/lurupugev.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/63418834927.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/linibosozejufuvejiguf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e5099054f60542fbe00233f5d161fc8c/83622011683.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/likusigosutevivarir.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/tamedowekaditijon.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/87237396490.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210810051204.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161037a3c59f93---waroxuxok.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/gupunosukubemefigu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/17b11480d85066a1c3e04c2b0baa4c21/52305424620.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/pagedipunudulomutevixa.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/ribidonisubugugikunus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+poverty+alleviation+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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 14284 bytes
SHA-256: d4506f0ab678e45a85f9a47791ac66629eb9b42bd3d88ad3f0fb20ff5c625af5
font_01_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10676 bytes
SHA-256: 7ccda37f3431a0f80b2c4a7e9987ea56bf3e9b0f68cdd28e24f9f3aa39afe00a