Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f445c222a8fc9a…

MALICIOUS

PDF

125.3 KB Created: 2021-09-05 06:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e69ed9caf725ac5aa521b52013b09baa SHA-1: cd01bb47e06e6b03c2487dfe218ce98a15a387ac SHA-256: c4f445c222a8fc9a8ece06a22c23f4403f2e5bc233bdb2d96e4ca7bdef6b79c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on various websites, some of which appear to be compromised WordPress installations. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing. The link farm structure is characteristic of SEO poisoning or phishing campaigns aiming to distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/58eqbfu226liph70nf6qk4lb01/pedaxikabefalalo.pdf In PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/wegezuzovudixubugazovota.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/95062621550.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e38b5f5---kumopukinej.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611898f115d93---84438480636.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/99289483976.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/29626844786.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/ragijogisufo.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/zunofowoxazemalinaf.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623943119.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nikitemojejuwobejuwo.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/bazekegavumopodotuzu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67924957911.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gukotetewitunafeme.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b82b89432af994e7a0f77c963a280dbe/67669089792.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/89177467575.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/nisokoxetalu.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/roxezamukuw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821b9ab4ebd---mirorezoziwiniketimi.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77365695245.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/mukuzatasipuguwavigem.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/roxobiwabemomopotasakojal.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49e9eaeed---62808849318.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/vutexesalaz.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kereboriwogir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=eneide+traduzione+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_off000180c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198D8 10420 bytes
SHA-256: 8511e81de46622d4ad02d47c72439e5b35eabd91aac1b2a195c7e3b4c93af8d1
font_02_sfnt_off0001b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B091 20868 bytes
SHA-256: 5dbaf06b90e83a4f66399c0047c41e6829a1695d288adb42dec33a19ff49b97d

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