Malicious PDF — malware analysis report

Static analysis result for SHA-256 30db2a0933a41af3…

MALICIOUS

PDF

91.1 KB Created: 2021-07-17 13:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 31896c9df32a1146b7d4572a22a10ec4 SHA-1: b7bd0fdf5bcb6c1f9321fd5fc3a7a9ac80c4a5fd SHA-256: 30db2a0933a41af3a9c29a414ef2455c26da6d1c492b8f017d17681bf52e4669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8crmi6tclo59gaph8i6226c41i/betijurotozuxatawana.pdf In PDF document text
    • http://rudolphalexander.com/uploads/files/susekov.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0db1f7cbd44c242c783acc572704b104/98293140463.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/borasakufas.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/90ee69d0ae293aac583335658db5d52d/dexomexizaravudobu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pdlvn788e8slpid6jhqtan36ii/55104912254.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/sutoronupewerowirebusufu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/zujenegomozetigawumenow.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2fcbaacee7338d79cde6dc3bddcb112c/mapodojadobak.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/31cf39007808d9bb8862f04cd4e2eb6e/jufikizuxalawavamojobeda.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/wazupodavipavitusajixeru.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ous8pm88l640vqnl7boo2bpof8/91658297059.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a0b1b7dad9ae96027cc29b07900fb3ac/sujonetuzijaduj.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/rasesebonogulu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b737e88b931---pifejopakozina.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074a02c245f3---60964585433.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/gapumoxom.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/52160355552.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef6a5d6aa---mivokiwobonigudevixin.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/13008aeb576ed0e18d83661da4b2c113/36152077389.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/12046953998.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f3529206995d2ca86b2a9c77b0df1f87/jebobuxosavojabezef.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/34489280317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=take+out+ofPDF 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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 9852 bytes
SHA-256: 300524bb063df53145dec348f2d343f3eefd2b71c8b4810bcdade186cc9a677f
font_01_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 17384 bytes
SHA-256: 8c7d3d9c69c94ec42e303b0a59371a8f8183ec0a6edda795556eb158b2fbc08b
font_02_sfnt_off00014837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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