Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690218a043f619e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 07:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a88c4c3ee8fd146655700e050ab3f72f SHA-1: d94a9ec30b78d8d5b90d3e9dda695fb627736fe4 SHA-256: f690218a043f619ea834c1a2039d540f8ee856ec162fb4ad6e87250455d8d2af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The PDF structure itself appears to be designed to host these links, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/87443828726.pdf In PDF document text
    • https://altonika.pro/files/fck/file/98220868123.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/fewabuzupojis.pdfIn PDF document text
    • http://cssh.es/img/file/68645304012.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051816215047.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4d4ac2d1---tidopetejozi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a730dbc2ce---26962539347.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/jodepowu.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/latuw.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c6f41835accc27806a93574d65ad9dc8/95539713513.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/milef.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/82205861754.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/zejumomonomatex.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/90155606180.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/74306236611.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/59761700592.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c770d81b59---84661159498.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/31313022910.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fb5d1fe620dbbb0dfe433a16782e0cf2/98459696536.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/kejifaluzewutedig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=law+of+attraction+book+in+telugu+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_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 11004 bytes
SHA-256: 7201229b9b2b8b850b8821fa645674d9963a00859562ee7da205f828a43382a4
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 18680 bytes
SHA-256: 57f716bf0b9ed63e45d00b6a2e8065e525ca3fc32df74686e509526a72d5ca1a
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1