Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c2d95f504c9dc5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-02 13:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 081cd13939e6daf48bfed2f4ed0c7f6b SHA-1: f599a9e2193f0c1c2fecd97cf5c5593a4b7f04ff SHA-256: 61c2d95f504c9dc5864fd167552ae5f3152a9b0f3260fe399511da20b1db712e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised WordPress uploads, strongly suggest a link farm designed to distribute malware or phish for credentials. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7ilos8gq8pp80jl100g7hj7724/guziw.pdf In PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/66826566960.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/kutamoxusibopabolojepuzu.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/puvowesuwinonepu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gffan2k16nmliue3kffj3tlq02/83672106376.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b7fbdd3c4b9220bff2d8ecf3a352100a/70520882776.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/70304386563.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/50065683691.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/26793165702.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074047edec86---fejaz.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/15210b6f26affe633336d7f42d607ffc/sovisulutupusunezeki.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/buromebasos.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/jipameluxupekinafimak.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/tetapaponajezixudewer.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/46814937282.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/69fe9ccf291a8af13fe8f1b0c87c09de/javugepemigumanujopajo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2156666fc09ec363534fa97a21f09a1e/jotadewukovefivuz.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d925178f9---4550743498.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3d174cce76ae3c22f1a362559f79a93e/wulokozavofumelux.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rixofenafej.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/66607265074.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e45c7c248---23470749554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=beverage+cost+control+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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 14940 bytes
SHA-256: ad9673f5f6747e1435f43d809ce9afd5c8f1f5156ad8c412dc954e5bbeb765f5
font_01_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 10820 bytes
SHA-256: c0f7d9adc1b28d10156566e76ba1635fb28aaa4c371ea65df1b07559b8ec01cc
font_02_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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