Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e40983d56940b4…

MALICIOUS

PDF

176.6 KB Created: 2021-07-01 09:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37a8fa76ee1d40a0fe335a0fd63518b6 SHA-1: b67a297d6e7327b2713de8bf1dc34c2f14f2a114 SHA-256: f1e40983d56940b4eaa6504c0328e768e7902cdfa8281e594789e1ace3c878e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations, a common tactic for distributing malware. The document's content and structure strongly suggest an advance-fee scam, aiming to trick users into downloading further malicious content by promising prizes or requiring delivery payments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mrih09cp35s18nua1e68g2k5f2/timukexonofewovi.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mlbc75cr74gflq32bqrhe2ar87/tevigopavabakalelaw.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0216534c68688f68a71409c0da4bc89d/16831487187.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/4a4ge4a0srf0jpfls7mo2a14hs/juwalakisobakapenipij.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lisunikapanobet.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/fogunaxi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c163c18f8c8---46683681435.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0690acf6f---dedogaxibidowida.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29bee48c0---duwukefe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/491da4cc1a1e518b88846f9f9c487fed/7877148552.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ofrrqqconnl65iqr71nit61sp2/gegagifup.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77bd29b1c99108e7360287022946904a/56878325107.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/25076993081.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf52e8b182---38512956582.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0d0e0fd4---donaze.pdfIn PDF document text
    • http://ledson.ru/upload_picture/44777535020.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080584c0ea1a---16364918321.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093959861787---velijiwapefiwebeziwixipep.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/31618422928.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bf2eeb89---jivogaponusigozusuzam.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061416273965.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dba012f7---31062990907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=subclass+superclass+and+inheritance+in+dbmsPDF 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_off00025277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25277 18560 bytes
SHA-256: beee188112ec313f6885dc6f3136d4520c757a5584eb5dfc8d01ccd7d5f43972
font_01_sfnt_off0002837a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2837A 10976 bytes
SHA-256: 0f8bae3cec181608a89444cd5eac799c94a796312acfb010483a0cce222a8c9a
font_02_sfnt_off00029c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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