Malicious PDF — malware analysis report

Static analysis result for SHA-256 1398d76429e2ba19…

MALICIOUS

PDF

81.9 KB Created: 2021-10-17 01:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 611019d2b86d29fc77e3802d3b4e9f43 SHA-1: 04308ba1a557e89795f077a740e16fef06941786 SHA-256: 1398d76429e2ba19b50ba4fbccf172b20c8153105c9b91db1be84af7932894c9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery via the linked compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.florentmaussion.net/userfiles/File/40040922703.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/86905960026.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/jezikazelebepolowipijunis.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/32d179eac97f6a5f0c3f826090197b75/15853021246.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/73040002728.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/939249067.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f9819dd25583141a8129a7c8ba0e67d3/gonagagelofugel.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/70954694762.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/35843470290.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/juduraraw.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vaduvifojudoferizomosa.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/namawifijexexanododun.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/zojipoxamugelat.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/pososepesumiz.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/xeloti.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gisibapukipapuwifawoxo.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/nedefereru.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/luzimibuvi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/13430945912.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/bazigixuzuga.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/77281455731.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8400ad4e---79584845071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=coin+master+cheats+orgPDF 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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 20844 bytes
SHA-256: 8025e506d88e5d14c10eb5549d6295eb60206b705836de8ab10f516a358631af
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 10660 bytes
SHA-256: 77afed41b672e5837de024561cb117f86ecff7a0f9ca47931fae364f7af9644a
font_02_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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