Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78fd2eaa9239891…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 06:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c216e30a9c69d4ba63a668b7de2b040 SHA-1: c2f09e4e1d62d74ccb8485f54e3bd218105d2179 SHA-256: e78fd2eaa92398910a39f5af74e1d5bfeeb016a1fa589d3169515362c9a08aae
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to direct users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6236

Heuristics 5

  • 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
  • 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://tidaksusah.com/contents/files/pewodupufojetejatilo.pdf In PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/xexugurexu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137299f84314---rajerutujorajejova.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210905151851.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vuwapexuniv.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/mipujevapetijuximijokoj.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/24920468667.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/51168317819.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/1199692530.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/89012816919.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c08594cb6---6811789190.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/47391891807.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/runiletigotug.pdfIn PDF document text
    • https://ckmandarin.com/uploads/29435061807.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kifigivowisakobu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab0e65ec4---85371467373.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/xavizozazeneparivu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/4737299514.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/45047819010.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/20439012806.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bewapajurewosozuzoxiw.pdfIn PDF document text
    • http://retailcop.ca/files/xomusi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398304500ce---nezopuxavezax.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613210d253eac---sokeza.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/10117312903.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/35578915651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=valorant+new+gun+bundlePDF link annotation
    • 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10456 bytes
SHA-256: 00104fcb98d7b2518a22ce1d8eda81fd6dae52ef890013b292300cb7daea79f2
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 18772 bytes
SHA-256: b3bc1982de7cded8f19b6afbf914d61256eeca02e1af464132d8d879213b24bc