Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8beb3670ff3db52…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dec07768c5f5f2328171a92d03d9a983 SHA-1: 97fc84e270cd1418a09fe934a258923b36f919b7 SHA-256: e8beb3670ff3db529e250756a41234e207342cbea1baf0bf21f76ca79d6f1454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://agroadvanced.com/app/webroot/newsletters/editor/files/75872715443.pdf In PDF document text
    • http://hasyo.net/files/file/59994465612.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/719b738c4ee00147b9699e3d6db6e700/54479081418.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1bbb67989bf4cad55c7a3314f6a29ced/68671289903.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/nekoluwabefeb.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09646d9fb---suviwode.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xoluzezapibolumax.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/72742293457.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/pusozugazewenad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a310492e305---93254289591.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/55e9e09bb77a8e69057630413a523175/tabejafawizo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c49539eb---mawoviweniwoxomala.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/39202570149.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/kunuzamilulofewa.pdfIn PDF document text
    • https://noventa.cz/media/files/file/sapemigusa.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kfreo5io0v61ldbq2ek93itn1e/levederitusajiritinexotax.pdfIn PDF document text
    • http://usmleworkout.com/files/file/20572011772.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/domimeredimilubosulig.pdfIn PDF document text
    • https://argumentua.com/i/file/7531975206.pdfIn PDF document text
    • https://bnovum.hu/downloads/53685380174.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/77096875377.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/20070109663.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/78b7a8d6456008a452e5d6cd96ca9989/72511245773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+my+phone+number+on+androidPDF 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_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 17428 bytes
SHA-256: ca2eb42cd4d4b2984c90ba6cd34e2b00265badf17ab0c419642691e3cc145aa2
font_01_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 10980 bytes
SHA-256: ab5cfedcb97b0ddd683f591bc84cad33d866294f94401e07b243edc772906538
font_02_sfnt_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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