Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c343a05c85d9fb…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f32aee86033ec54712b51b29b3357c08 SHA-1: 3b2cbf6853ca99c0fc76bc13c71654f208b8caa3 SHA-256: 84c343a05c85d9fb671710651d0eecb001122d97b62c7be6e04628c3f6548aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95 indicates a malicious classification. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/39quebvgcv8vjle8c2kr5n76u9/nufepugivugenodemob.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/62641527947.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vorilinozaru.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/nominonijow.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079c27a7826d---fakijifomikumapires.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d229d4325d8610b52b0d3e2a8da629cf/26944122774.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kkqn1fu8tae0m2k21rinlcfjda/figoxaw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2f14cfc27e4c4fc40359dc1610470776/23724886560.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/87796140695.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/dinososasojikagawaba.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/508d5cbbb11aca4744e0430b6dc9c6ab/gawakatoxaz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add75676c28---dipenugezotagizagaxunam.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jegot.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16072260408655---tenarupibokaman.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/14871300987.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/dajofowepo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nhf644r2vm5bfhhpihkkq2h743/41205341666.pdfIn PDF document text
    • http://jaatkinson.com/userimages/97203042133.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l19je0o6smoc31p8iripas7vo6/81477691630.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zezidofifinewoduvizeg.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/maxedunaluwimitiliz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m481lf84dqb1qeogua22pdqc8i/14849753330.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kcv80o0bsop1piuck3ho5tc1fa/zinetuwuvubixuputi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53cae92961---6439222959.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/32441607820.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vemelitumafojufemegewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+rule+of+law+pdf+downloadPDF 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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 17020 bytes
SHA-256: c04d202ec8af8a933e83dcca3d1944414de8ef5443ade8434c0fa6dda66faed7
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10384 bytes
SHA-256: c1cb8e3db5723505ec0ebf859aa5e3b596dacacd323a9cc0bb180be271130faf
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1