Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f6caad6b1a309f…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 10:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ffa9deacdabbef49593243239e499ff SHA-1: 8545ef8029599c3fc95f1689c7da5e60f806bfc5 SHA-256: 91f6caad6b1a309fb88f51bbd3f07b529432516ebe4f7ee09ebde12f4f01ff8b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many distinct hosts with few links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://skyzoan.com/cake/beta/userfiles/file/patupemikoligeravejapipob.pdf In PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/241df62bd1a707440886f36e0e98105f/91132563605.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc3ce792---zosufefap.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1994c83f952c351465dd61d11c495f74/70183662245.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/neeaerh70hfpq50tu7rdpkm115/wobukakin.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fpd3js7pt5170vivab1fpg3dpp/91206538240.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s51s4cg4fa2ccv5patic7jpuu6/83450434250.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4n0p45rp4hg695l7nqr1t13et/negosizof.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff4e0ac7d---80015123657.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zafitafulazopefe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8b825e96---19133946230.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f5571c87---tivubivoz.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/25946698666.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5386e6e39---69058591839.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083090291371---felisatedilejuke.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/a6f3719491d57c1e27351ca170508e46/85002938738.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/mefudikasaj.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nozaxugemedeluke.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/apuqhtgpa0eeboojc5c8o7khdm/fedexebovuwekexijiralise.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cabe0895176b6e2735b69c2580f62b13/xuvidede.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160733a08dbada---80366587228.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/18044770991.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/82337873709.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ditixagofudopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+many+bits+in+one+wordPDF 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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 19064 bytes
SHA-256: e2a47cbc78ef7a63b442f36387455140272cd6f49616def78e1070d2a9c180fb
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 10696 bytes
SHA-256: 548f73d85cd6a9a536ccc1be97d63ff530aadd9f12da04051515e8c262c96cb7

Open this report in the interactive analyzer, or submit your own file for analysis.