Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d04f515bcf6b1d8…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 20:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9990dc44cadbfd58e58fc06b15a99a43 SHA-1: 5751c4ce9838dd1ab290cbcb32e59e08dbfcc8d1 SHA-256: 1d04f515bcf6b1d8e54fd0cb95ce4f3506b34820d8dd69f5d3a4eaab6c1db3e3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URIs and compromised upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://snoman.mb.ca/ckfinder/userfiles/files/kakemuwezawezigedane.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/wavewoledemosewuva.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109300920227193.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wibup.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/58109385839.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/38277872682.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/84053180021.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/42558558772.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161452d0f15c1f---88257253973.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cfaa1372e4cf43bf862661c17148736/69809940126.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/79211965622.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b515787cc5---gaxavegivedodamuzoranemo.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/84595501267.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/xejotopaforisu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/bimedaredomujodiwoteguza.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dus9pp6j3n0or215597knt2c01/84327431507.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/52068755803.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/82257003207.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/rirudite.pdfIn PDF document text
    • https://chptravel.ir/data/file/90288045980.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/lekiratipo.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/welasomidezivedivesobam.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/tusudafenasetagifiv.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/gibarexokorigaliru.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/xujujiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=youtube+to+mp4+unlimited+lengthPDF 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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 10708 bytes
SHA-256: e1512c9982b4e5a17bbe9fce73626757f2a2c6365cca82dcbb1fec3042d33eed
font_02_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 16448 bytes
SHA-256: d11ea03c77981374a90edc4ef23e97547bcd744c70e3707058804ca7bb721080