Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad115b6b56162989…

MALICIOUS

PDF

103.2 KB Created: 2021-07-03 05:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 044de7e1929c6569c04a617b955643cb SHA-1: 409e537bb5579b58d9e4d8015447e27866b106ab SHA-256: ad115b6b561629890b0f40cd687ee46863af98f6258aa571e21d4e6fe791ce07
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to these compromised sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff5c239e2---sejodedinelona.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/dc1f6beafcba4ead3744ca95134218ec/86955534595.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e72a36493232c2bdfc01c6d642b961f4/nevawajamimutawug.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ndmi780a34lu61gpskro55lfmp/70842770391.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/i763s21nv9mcsc2f241u2i22ii/gidexarekepe.pdf
    • https://clubelsendero.com/img_pag/file/14271102295.pdf
    • https://divinenine.net/userfiles/file/4487240152.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51ca89cb6---10019653231.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160853fed6818b---6962239136.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/24c0057b6054b66b9b18257ec9bff435/koladabeligiwok.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d2827db71349cb4dcf5b9b9e0574da2b/83730429753.pdf
    • http://kino-cosmik.ru/sadm_files/manifar.pdf
    • https://erdemlerkoleji.com/resimler/files/jibede.pdf
    • http://abwingssuffolk2.com/uploads/files/pusaxunaziza.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/162a189175217dbde2a2b06f4570aff2/bikezuxibapadakolaloj.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4056880a7---tuwipavixesanagituz.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e35ad1027f2d53056fcc13091d635c70/34513257280.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4hp00et0dj57i7t7sqt7eqbuhq/paparubigasifodegumav.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7887ba75e2---supere.pdf
    • http://blbr365.com/userfiles/file/1621209542.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a8a7b792---kogiserifabovipikizawif.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bea6d263e---vojofebegupefivusozulad.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe43c9876---jupafenivinesuwifozal.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca143a385f---dedelaxunefuf.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8681df479---54221094265.pdf
    • https://allmassage.net/upload/file/20210514190617.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gqvsd5bacagakh81t4pecqjo8g/33320201980.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+tipster+tips+180
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16792 bytes
font_01_sfnt_off000144dd.bin
f64ada470b406f39fb42842a7ae49ebb97561d0f2f5bc12a83083b6a73f1c211
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DD 10172 bytes
font_02_sfnt_off00015bc7.bin
13c369f37a257e4e5399476811d9aa6dbe14f4505e826c5afb77e1427c73e8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC7 19808 bytes