Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbf817b0eb7a09e…

MALICIOUS

PDF

82.1 KB Created: 2021-07-04 00:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7b9513aaec80125b2ee4f0f9c07f6ade SHA-1: 3b0a13fec1fe911fb78d63bfbebedf211f7635c7 SHA-256: 7bbf817b0eb7a09ed30bda46f00add0dc2a4f805f0bd6b54f4c5c587aaf158de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the use of compromised sites for hosting and distributing the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4fa557c03ab3a0aafb1fe8f2a0738ea9/xudatoxibasowumaxeberevi.pdf In PDF document text
    • http://esthebel.de/userfiles/file/kobikodopasotusekosit.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/regomurefazubalepa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/29483520344.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/pujunijali.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/7289264972.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vetonox.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/42446266220.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/80444397469.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9mv2b976bgq119sdhnfk7sfsar/jomusupu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12ad5f66---87109734690.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86e4f9bf8e471ea5b52534e6853c5501/97069590592.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/14176657642.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcbf8d766---lebifawufimobukefaj.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/fuzefizotijurufekelog.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/71140968955.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/07a571a36a46db07c9af4a51abdd98fa/5464963559.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/sijevokeb.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162508471896.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2bdb6e89f33e832ff8367b2be6c9749e/xizidumavivo.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/95334042511.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071901f31cf7---90128982144.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jofegedakado.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/31184017539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=black+wallpaper+high+resolution+for+iphonePDF 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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 11092 bytes
SHA-256: 3987330b4fb95cc9e54e4e0651c644984ff9105969f75d29385ee57ea0266b68
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 17740 bytes
SHA-256: e68a9396dbf694075e241b0e6248f3b4162f7f4ff08d78d55b492d9dc180fd18

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