Malicious PDF — malware analysis report

Static analysis result for SHA-256 488f1bc46708752f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 07:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1184ed3786f7981b29440a624d79c99f SHA-1: b62a4c88e5be8618134327c72bf04a7bae56514a SHA-256: 488f1bc46708752f205cfa083398aeac0bd29936f31713a0632c6b125bb074a6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eiak.org/upload/editor/files/71533267585.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123f86c7bd75---generabekizusodewogog.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/63607087501.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/58eb66046a251b02f57d470917c99854/tepupuwikewesa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2fa295af---84426824806.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bdfbcd66---pizizinifujepu.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/34000203523.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610f660005767---jirasixojevorejiwasul.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/wujejiti.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/81356307861.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb6fe7015---50353743663.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbd650564---gujubijegateziwu.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/tepexutemobomug.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be87f223cb0---20844941122.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/27tse2549ju3lif281u2kr4p66/totuzade.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/50d070730e5c35a607a3dc7a438f8787/42191966012.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/fimonokavaf.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bhva0os7l2quotu4h8flf5th3/90579480437.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210829025839.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/34231572048.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47307144936.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fmqbtdr0kisj2vf0tpb1ho6t86/40133246686.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d9e478fa6c4740dbabeceafdf489591c/gilenegusola.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/83057725215.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b07fadd53f82f6dd6baa8c184cdac7f6/17411812939.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kd0u8ju0mam1jkg43epdecok6i/29003945974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+milk+made+fromPDF 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_off0000bbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 14708 bytes
SHA-256: f26f91915d4ded36414ef5c960a2e66673348e3ef6a2520397d46e69220465d2
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10600 bytes
SHA-256: a2cdc14e2b3ef00395cbc4388027cf94a7a4d3b98cd67d21017b4d0ab6628e12