Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7d318547f7a2dc…

MALICIOUS

PDF

103.1 KB Created: 2021-07-23 04:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: feb04e8875eadeba2b083e5c8b187e14 SHA-1: b8328f56e95bdeabf85f8190d132f9684a274318 SHA-256: 9b7d318547f7a2dc07400ca285a609d5f00c14d226bddb2cc4cd70530f619cd2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a pattern of leveraging vulnerable websites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d742a8c80d---giguwebakilegiwov.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada0ed29e3---62403202504.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/dajajekodedogovupi.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/16040610281.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14oa0onhtaki8grshnodh4ar85/1045999585.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tdjsrms6t1eep08pasj1c8ea85/44078812760.pdfIn PDF document text
    • https://masukpt1.com/contents//files/tuxupisibalimemegidujebu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/piporosezori.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609519f3d3108---41346804137.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079331b3ab75---8681128946.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210613180453.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xapasutenifapu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160abd63ed839b---2653156109.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15297575f---41002404793.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/73730127741.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc1bf1b55---ladivawedafufifabujero.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc1a57777---53545280383.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e501d2555f0---beladulapoz.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/damomodezalurigetol.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ed7d5507716e4d11e36a318163bdf7e0/begodukavarifemizizuperiz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0caabd3ce---73300229100.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/255374ecea0ee4b3ce7b2536a4bbdf24/67230915442.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/61320988343.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/zipuxofobegomenig.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11799a34d---besonafuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=college+student+email+address+listPDF 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_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 10724 bytes
SHA-256: 0d9eff0d505e60ceb5c73694642c1580ef0f4c1df52aa8dd5c0759d41081d96c
font_01_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 17604 bytes
SHA-256: 89ac3c22d8c4a786f746e1240fd686d53df8048296af0a8fe6f7faa00ccf3636
font_02_sfnt_off000175a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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