Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2cafbeb0f4270e…

MALICIOUS

PDF

77.2 KB Created: 2021-08-04 13:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac1c8054f69bfa6b9aeb53ebab1f8c84 SHA-1: 3e19d7789b02e616025ef708f5d8ad87cfd05733 SHA-256: 4f2cafbeb0f4270e941fe5678a053e5a4e01d6e5f8c94812da0e61ebf2581c40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=when+is+crabbing+season+on+the+oregon+coast PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ed8b2bd---vukezokiwelozo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/fuverijaxenolizoso.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/69914350049.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/xanoba.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jakonatomokujilojevit.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/48051079790.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1a20671a15ff704591038841ece90705/xaxusubufipozasujelugego.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210708155232.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/40268151428.pdfIn PDF document text
    • http://splogservice.ru/content/file/17452912557.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/tujotaguk.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5189f19e56fecc1d78f887c2b7f5da6b/ronepulibaganefotore.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725d742a663---78493478487.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77661071016.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rexigumonikokisoxisu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87caab8cec---10831612905.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/00430c28eaa3698aefcb27a72152e258/24542103902.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/95382463862.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161013f0153f77---52881212520.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad964310258---30071694136.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/7572997579.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fegojopabisikalusezed.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f95a9e43f1d6ad2a772c637a8d1e163a/47946030519.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/ripirosogegu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/gipakak.pdfIn PDF document text
    • https://priscar.com/documents/files/44960758001.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5gd966fl14tl32qt1bia0me803/45616977326.pdfIn PDF document text
    • https://lapdonline.org/file/ruzosajuwigige.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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16200 bytes
SHA-256: 4a46b1fc40a5f0d1b462db3bafc91981c311a3d60393b92f869e38c7320bde75
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 10596 bytes
SHA-256: 24e38c8d40c7521db30e329233b344dbc8a3ad6703b97dfb1aac9ad222adaa5a
font_02_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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