Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a38a8cc76ebcb8…

MALICIOUS

PDF

90.1 KB Created: 2021-08-05 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8f270420d808106a20ee85674b09558 SHA-1: a8144e28ac4e1ecbdec42432e3f4339808b5816e SHA-256: 31a38a8cc76ebcb8ebcb12e2d78bd03eaf0d908649f1a9e681daf01fdca6fe98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links suggest the document is part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a395aca2fcf8ed06d66b5d18aa8257c1/lojetipekimemiz.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ab85338ebe3f201c6c21f84e6b21dc26/musuvibenegasebonuki.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d7e04130---37158104892.pdfIn PDF document text
    • http://mp-journal.com/media/file/81063129196.pdfIn PDF document text
    • http://ttc-investco.com/img/files/sumubijifugu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/faxetogig.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/54088572987.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sulis84bosnksdchhep9pfj78s/dunovefe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b04b5758---91469048964.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d17b1e1e6---47560821729.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vaweveku.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/78914618324.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/nufezolomoxux.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/gosalas.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/knkkjqcqcn10id1n76b4huobh5/zutudugafigadutoxone.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7384283265---mexukemojotaxuzuj.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/miwef.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4af160ad8f646b7d289cc69e02f27192/zobugozogasevamukib.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/voxan.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41859828055.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f2a6esbvl0i0hnkmqo78on52s0/jifixodivok.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gulovexokumasenedufujijov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=facemoji+keyboard+for+xiaomi+is+safePDF 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10944 bytes
SHA-256: a1bc1135af01f769b4664ab2be21e8ac9f80098f480f83e10c870c7e95ec9fa8
font_01_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 18380 bytes
SHA-256: f96e6ee19db72ba305c72bdbf1202325354fa23cadb160131e100f3d5466f51d
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 8952 bytes
SHA-256: 084aba20f45b3af06b7ac479f9c47f2f4f04d28e681e3ec8c8cf5ce34a72f99a
font_03_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 17096 bytes
SHA-256: 31a0767b6a7eeb3cae9b60d32a3f7d7962ec75ebb3c48261de585a5b10803913
font_04_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 2472 bytes
SHA-256: 58dffda9599f102c4f270d1817f4b28c732ee2a3d72d3d5cebeb914cf9d37331
font_05_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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