Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f98cd58ad637f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-22 16:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8724826c40c759c35e0683085f424f7 SHA-1: 353b9e8cbbe52004a94e2974d7280a09da630e68 SHA-256: 9b8f98cd58ad637f369fe16dd3f8b894442d4880c303273ffe68f2b83d3a557b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://birgatour.mn/js/ckfinder/userfiles/files/ruvosav.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be27ebdcd41---44909050597.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2613851718.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/11360535804.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb633c8368---52084280208.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ebd3caf85d439e1be7a37e653554b25f/toxaravekazulotiwanokuji.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/94442111560f4b3a24e47d.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/16801496800.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708bfc16e3e---73870237323.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/pinividikimidefere.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/li8kt6amtr3du7hf3eed62dfu5/53632443791.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q6pa29cr43fh0b4r4lhk6kdp5i/kojawamewiga.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/gufoxovexemamabuwixavote.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9b3g5n6aomrtalq2kra10ht6q9/92713087476.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5453537270---33772847117.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70208358338.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ca62be4b7---99972533214.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ba27dc3b---93353171839.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/2714787930.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/56624209858.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca0467b5---92321782101.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/af2be696c1e1899393d55d2a5995cc38/kekumu.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/xexevitoxatesovugoxebumu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5057cb6107f40aebeef4b93a5312c32f/benubigedaborazodenulatid.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lavanesutegelerogilozulom.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/rikapusep.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bamawazufotofajujoxoga.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kigukutekuduka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=expeditiously+meaning+in+tamilPDF 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_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 17324 bytes
SHA-256: b03d480c90959f47141f680ee6d07f93495d750f62a038ae0cbc1efc25f601fa
font_01_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 10936 bytes
SHA-256: a81192194753e18b6c28b17a81b271cd53e2e2513aaf6e868be98e29803f22eb
font_02_sfnt_off00014463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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