Malicious PDF — malware analysis report

Static analysis result for SHA-256 5923b88bbea8f287…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 09:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0a77a7c68872742d043c8bef195b5e3 SHA-1: 4eee78aedb30f587c5406da17ac3414a3bc25f89 SHA-256: 5923b88bbea8f28784ab8e294e096cd974111e571d5027f03373a047a814fc4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://philabc.ru/uplcv?utm_term=ct+scan+scapula PDF link annotation
    • http://jiehuist.com/userfiles/files/tipobuwerazof.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/kijuzuzosujemojidanuweb.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/15df433e0e9f15744da043fa8393a7d7/29260948804.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2af7675390e064f10a1696aee1901521/xonotibofogatifedativomo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3ba57d8922d582950d806dfd1ee1d8a2/pejegozupedegujugu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/44040737615.pdfIn PDF document text
    • https://businesslife.com/content/files/91300058972.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bcc3cc57---gejakejuwivizexixane.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160880382a66b8---79930778157.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b707093f---92490307289.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210531_011108.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/topemulujiz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2f8aff833d4947d1fca6d5891e902cae/2392276333.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/gilewivej.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac45e142a3---57395721215.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/rudivupateboduzi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be7652fdd---lozaxuguvurakekizomikej.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/noralimelomos.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d43368e60---maguwemug.pdfIn PDF document text
    • https://cargotavio.ru/files/file/39892171097.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/193cdf592bd717eb016c1c8962408cbc/wawerutitipojawufevopi.pdfIn PDF document text
    • 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10052 bytes
SHA-256: 547166142e7135cf4e042a06336ef813d5cc02598a5a518bc03188c216961eae
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 17276 bytes
SHA-256: 56424cae7b99f4baaea12d01cb8d33942e404e6fc47d8de84acc6362b488f785
font_02_sfnt_off00013905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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