Malicious PDF — malware analysis report

Static analysis result for SHA-256 1868052f88c5d6b2…

MALICIOUS

PDF

92.8 KB Created: 2021-08-01 21:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2ebb81a3173658a75f7a91135525278 SHA-1: a11db4f7eeb514b9863d3475176011093899a9b1 SHA-256: 1868052f88c5d6b277d8ed11c34cccd3d7f79f5548a0f3e6de9d916b65042abb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9bf3b22e---kifeteram.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad52adbe6---58762906149.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210613145350.pdfIn PDF document text
    • http://fedime.org/imagenes/jeloxidifogitozug.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4206070d2f51336923aa12ae61bcb28/vamumabin.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/3706004333.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608429e1e3211---kunerosovekabewa.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/86893302977.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/51pp83rbd4dlvlflepd5sjkmo0/37735015284.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/69166026176.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1189c1f69---dikor.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/fijafuvogugoj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b745b6781---74005817242.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/86057621519.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/693dcf9b905dca49b2ba0ec7c2c29709/wibimibafoba.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/71d0c4acc8f71006848c362b53356cc8/dovozed.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dvld53tkrds7bhkkqmd1dcum6k/58320889867.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/70890625013.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zafimijukejavabijawufoxe.pdfIn PDF document text
    • http://kunbot.com/upload/files/limomosasinepulimu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/77718998829.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3fbf70ed7791ddff3a8feff114289c18/30635301812.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609264855afe6---29763496247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manual+refrigerador+panasonic+inverterPDF 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_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10952 bytes
SHA-256: bf7b7ae8558d36a047ee3795c12342096c6d0a7b994f7575a45c5a55eec04832
font_01_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 21200 bytes
SHA-256: ad0b491ec48982ff0006dafb2acc887447b9418f413ab40ede4ce84b84903805

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