Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1600f418c0c419…

MALICIOUS

PDF

91.6 KB Created: 2021-07-29 13:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcb0295f39fad848c3c24c1bd50a1306 SHA-1: 3e3b5cbcebdb2ce1e85110274d6cb34d6b1ab499 SHA-256: 1c1600f418c0c419bd3cddd5586abecbb5dcd0ec78a706f485fb0b670963b702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content, but the presence of external URIs and the overall structure strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cremyco.com/app/webroot/docs/file/pijaduforafirotevavo.pdf In PDF document text
    • https://altonika.pro/files/fck/file/tiniwitolidodogevivut.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/95371917449.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rolabovupexe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f68a1b812---47978374439.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850bdba205---jabebe.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/57665799918.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd6de00e7---53040935932.pdfIn PDF document text
    • http://getem.pl/files/file/83448544736.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e08b204747e721748e849a55baf783c/54677521654.pdfIn PDF document text
    • https://mahae.hu/files/files/75559655480.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/6812b3b8f235712e55f85f53895a5e73/32018750060.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/guboperegepumagu.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/66882197856.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/08c53b533cde72d50810e7aefea36150/96506613764.pdfIn PDF document text
    • https://hgb.se/filer/file/87722502438.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6394f03c11bb501697f4e8e8d27c1abc/67245618204.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6734a466813a42e190ae1e9d0e54a60/2801107590.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6d9645e5641dc123e225a6225447ab9/xijefojunasetasebetagowa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc7159df8---56128825374.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kowebimanupuk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96ce810500---sasifunufamifa.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zofoxupafi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a7f8cc43acae7d0142c215654f4c62e/70967058016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gym+workout+routine+with+picturesPDF 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_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16840 bytes
SHA-256: 4583ad0efd715c7a5136192d7fed20bda9644604cacb54c1e04909ec9fc3c64d
font_02_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 10864 bytes
SHA-256: e0b18f734c383aeae38322904eb15f42ceefbefac2bc8c995f8835e3d87c83ab

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