Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fa4515f788f13c…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 00:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd19c7b7da386a1b741b062132b2e8aa SHA-1: 97c1778d87d540a9f89c5dde5718c34d36350f33 SHA-256: 46fa4515f788f13c03713d021c6173c6a5c9b9ae9444dc267ee97e5d20932c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage, suggesting a technique to host malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggests it is used to redirect users to malicious sites, likely for 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 https://chcial.ru/uplcv?utm_term=narnia+1+123movies PDF link annotation
    • https://tranthachcaodanang.com/uploads/image/files/82938419652.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tefesazebibejozitumo.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/10753705819.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/81662893596.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156271a182f4---57643444491.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d7c407249402888acc86a1042b2c31f/zenebopa.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/butotezem.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/pijogo.pdfIn PDF document text
    • http://edallyshop.com/upload/files/dugubuvovefogiz.pdfIn PDF document text
    • http://ombs.ru/uploads/files/58907266694.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gagatoropalatekifobakup.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5e106a1d1aef8ce67eebf325b258d4a0/fusenonaxixatedoxomeja.pdfIn PDF document text
    • http://turnyras.lt/Files/file/9711025243.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/6529127097.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/95898715154.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4a3242e1c---sizifugunogakenaf.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/47156096669.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wusuloxajoboguloma.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/xivumevotinukozelemaja.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/xadijovovuv.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/jawigunukig.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/53377840373.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/rafakugiluxa.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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 10512 bytes
SHA-256: 64471e6d5a56aa606a3d3ebd7b4d311ae1393bc562396f83210a972285013cec
font_01_sfnt_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 14512 bytes
SHA-256: c9e9d71d6549196094c0350cea539957384b73ff1c1a9327ba24288f532891d4
font_02_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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