Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca29445bfef8adbe…

MALICIOUS

PDF

91.5 KB Created: 2021-08-17 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c22a19b073f1c92c5bcf090eff01ef19 SHA-1: 80ae3b92e1dc4c5c377a738dfc36238c133aa743 SHA-256: ca29445bfef8adbeecb7958e686326d8373ea38a0e8ecebf1f1822af555a82e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+get+muslim+minority+certificate+in+telangana PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/833fac6e163a1e1f990a7fb522e44693/96123156861.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a45877881c7---siketadi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d4d75ac88e219122eca015e7e30d1b60/77949702098.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/12749141824.pdfIn PDF document text
    • http://wwstationery.com/files/file/88761636674.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/43085325664.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2908503948.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sajobosuxeruxatuzako.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/49581816912.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/17914538118.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ca08993d0bdfc5b0692739be82817e00/5835877471.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/60feae075d543c103ae26eceaef47910/59175430575.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/16c61904239fa7fc9de609eb972f927f/nugadasozome.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9dba2af55---webaf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259f948c0c.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/binizog.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a91972ac33c---74975251231.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/g00c558ktvs7qa1pt06742tmr6/83008829566.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd4f64eb9---zinuwimozuxusawa.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092129ac05b9---75949040208.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bab0c1817---72437217353.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/xinoremuraxuwunipaxanoj.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7dbcb6427b30d3f8fa41cb1035b5b3bb/59421676912.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210618021734.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/89789610212.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608467b5a12cf---fugalubirapiwozefomofuxim.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/kesatekoxojezugu.pdfIn PDF document text
    • 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_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 15980 bytes
SHA-256: 3a8c3e035edbb93ccedc468d49bbd29f1c6fbb6abb56a53b0728ffaa2571efbb
font_01_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 10968 bytes
SHA-256: f43d43732b3bac8012e74dfed1b8ee31bb7f2c1eef292d750fc61ecea28b32e2