Malicious PDF — malware analysis report

Static analysis result for SHA-256 286535061806362b…

MALICIOUS

PDF

145.9 KB Created: 2021-09-06 18:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e77c7c50cc58a8382836e2bd101dddb SHA-1: 08205ce3bf76c88d4639e30eb960390aeab391c2 SHA-256: 286535061806362b6f017ef3e85c1b11824e342147ebfacc466e4cb0c4a2056a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_URGENCY_LURE heuristics indicates a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://brazilairporttransfers.com/ckfinder/userfiles/files/dofusosebob.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/78638589147.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/77669171570.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/labeko.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d354c4410---27639403312.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/62632678014.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f01c7ebde1a28d70dfe7ecf459ba731a/giramevukivogofiluwa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/611ac51d420f4e9b16e7c310a4058938/vodatesizogelogekivez.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xupitodivijir.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r1hcr1if146477amrm8ccbs5mb/61232526435.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99e1723e98---53380427480.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319f71dfb76---zadopo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/korakamoraxi.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vagezumowisufusudakumep.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/56034479825.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983bc809a0d---47155468156.pdfIn PDF document text
    • http://topstec.com/d/files/fuxegutimas.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33189468970.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pinovakibofejuxitipizixux.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fuwepopowibebonon.pdfIn PDF document text
    • https://digireg.dk/upload/zosonawupipiwokoretorijop.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9014e13de---94857422398.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1769c25033---setigupodomumutelo.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbc1b03a---bonagav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+youth+football+information+playbook+pdfPDF 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_off0001d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D422 19780 bytes
SHA-256: d8bf27362013b2572fcc8518b6088a344d9524cca6efc986a358c563116c2317
font_01_sfnt_off00020775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F8C 11020 bytes
SHA-256: 2090d6645c8ade8bf1c5c39dce16c85715fd38119b655041e84e050c03423a39