Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9431cada0725b8…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 17:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fa04ef037897d75433eaab1479f07b23 SHA-1: cc12e5f7825ed298ee6aacee664bac56324e67be SHA-256: eb9431cada0725b8da5d10c776ca5b1744d88f21bbdac5b966d1f3427430c169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kartplast.com/resimler/files/9496921743.pdf In PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/loxawenebewokejasipoje.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/digebewo.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/fepedonono.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/10318810265.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/57709610899.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b9585dd2---82152327197.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f57b9bbe40d---52153530777.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/9727496186.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/12793668686.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/beveno.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/lafuvapodemawigenipidovi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190691e56d---rediwi.pdfIn PDF document text
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/2318035823.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/zuxuvuti.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac9b593d08---90871088681.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a85f9a4cdf426d4aac7d4fe0022109c6/jizixivogagipesekubatixod.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/70b1a6c528f5440ba25380d31a9cfc40/99822474551.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/jusileniwekojeg.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/61799510090.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/fegajufebekugadikole.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/sazudebelovigomimifa.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/4671652248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+anyone+become+a+freemasonPDF 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16988 bytes
SHA-256: 9dca498715eb0c7e9cb4f16a8cc9ac41617a26353537edcdbd21f2ee1f57fc22
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10548 bytes
SHA-256: faf78fedbd292dcf9f1f8c4d71270c6c7ed7cb6ab441d396dbb90135125e373e
font_02_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1