Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d1c7fbacc47865…

MALICIOUS

PDF

149.6 KB Created: 2021-07-28 09:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7a65d16692d9af2712c9a0d90290848 SHA-1: c1459a46ad073b1b89bab0a83f98479e6e098eaf SHA-256: 09d1c7fbacc47865e0d367f5653f0bb59932ef780152dd178efe4924813b7f20
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5710

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://dorrstrechy.cz/UserFiles/File/8664300426.pdf In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/wafusalumufuta.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b280ce06ad6---makidizaluxiwubapudezimul.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb87192fa32---xigetulugowosugilenewite.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/bojuvisabuminisafuvogaje.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/qfktkudq3jfchuc62lobc8pmrt/rudixuz.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/79132571231.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba0583c49---91875299958.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5491ad15---paluzorijanigigaxanu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/233ab94fbbd58ff5078747a03bb64fd3/53400291194.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6835cb45d0b13d4bb4ee57b7e252b4fb/zasurimuvosupanikek.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/abd63779d92475ec7b08cd5c6998dc27/zimexivipoguwavisor.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f408bd093c180367d10d0644ff5b9042/kolazuniwuz.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/lelubiwutebuma.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/davewe.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/lufegubekesetu.pdfIn PDF document text
    • http://ridendo.cz/files/file/19748191641.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cc75b40d---52498825986.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac31d4351---2766301957.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/56233420901.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/19035036244.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/64164373767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iglesia+infantil+asambleas+de+dios+en+guatemalaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2260D 18604 bytes
SHA-256: 02aa3310fcb93b553eaa4b9afeb67bfa547a3041758137cb79d673c6268658d6