Malicious PDF — malware analysis report

Static analysis result for SHA-256 c897bf042a9cff9a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 09:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f59f28d7702b3b3f845ed327312bd268 SHA-1: 91b258a2d6de0b2b62355d080cdc06d32c018cd5 SHA-256: c897bf042a9cff9a76fb5f55a311f24a0cdef986c11e685d2f32ed876d457f58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to PDF files hosted on various domains, indicates a link farm likely used for phishing or distributing further malware. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://classiccar-jp.com/js/upload/files/ramenarajitoj.pdf In PDF document text
    • http://kasargod.net/uploads/file/revepepawazapaxapijojizo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210808124422.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/54366419287.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610494745b1ce---ruzidelutesid.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f5db1e6e---lajabasuvolederov.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc77503ff1---siwupubufu.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/31888880631.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g95rcb953778av8uujkel2uell/napakigoremobizexasoz.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/78939167910.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sv2d74t33j773jhqqukf8k3bpj/wapegenenixutejoja.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea5208222---jozasonimegezofew.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/60363639058.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/42719423738.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/1279300176.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/zagozejavom.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465d6a69f7---60995628146.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/54817438899.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ff46acacfb9ca5d6d2644349a388ccc/49062636059.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588086643a---dijeveru.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5fae43fc3b993544abb40a4c289e9257/tuzagunipodo.pdfIn PDF document text
    • http://hangquangauto.com/files/64698250328.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9a441f8b---99486248063.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/75319963048.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b5ce7aa0424d64100a2fdf716c315fb2/siwewixemababimalus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapelet+de+lib%C3%A9ration+et+de+d%C3%A9livrance+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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 14720 bytes
SHA-256: 52dc99fcfb234dc939767fa1e7bf631b946caa3bc3e3d053040a19b506f56a3d
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 10940 bytes
SHA-256: 92deecb3795ee690a9a84fb28ee0e84ac2c0c79a6599421802e4d3509e371b2d