Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57a914bcf34b09a…

MALICIOUS

PDF

74.6 KB Created: 2021-10-09 19:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: fa70bbf33e09c5e44dae98b612c6bd79 SHA-1: 6ab2053030ea0284f286dbc472ea0f0b574e782d SHA-256: e57a914bcf34b09a72949cff4331d28bc19d76bfbd8075b455ce4cb581bef055
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=on+time+logistics PDF link annotation
    • https://sinarlangit1.com/contents/files/jefefukal.pdfIn PDF document text
    • http://artio.pl/files/files/kelolu.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/nojubiribex.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/tufefozabizikos.pdfIn PDF document text
    • http://rcot.org/userfiles/file/guwukedujilunapaj.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/fewagi.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/zubosafudexosubi.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/41660876278.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/gogosofi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/1557534357.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613102aa1c43b---96395640535.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/genepa.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/zonoxalutoxukeb.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/38531589621.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4aa397016362f02bd685f70300136871/10208593718.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vekofefizilej.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kipizoxixero.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dc1c649fb0---vexomixatage.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tubekotipolabufagew.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b1f8b8809---59226328364.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/pezamug.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/15f36b19b0c560e32987cb015a7877f2/24285782490.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/doxujun.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kuturewosorof.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_off0000c1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 10336 bytes
SHA-256: 175884fcad26b5031a7f5e9fc0cdd77f123fbedd10cdee9666bd4e6eca3ada14
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 17012 bytes
SHA-256: 611df06952be987f3f3ac500e32c89f8c75a5b6f42f2648f20063172dfbbf2d5
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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