Malicious PDF — malware analysis report

Static analysis result for SHA-256 211330a39f34eec3…

MALICIOUS

PDF

120.6 KB Created: 2021-07-03 15:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eac8110272ffba081a82f0429ad7460d SHA-1: fda47397e5c40e7309a9b0d59bfce1d2d70c1b85 SHA-256: 211330a39f34eec3ceb7c9c6938b7859aad4f62524634b469ba3b7cbb47cd296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDFs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7ib61mkvs02di5h5fuehm9chj6/77382232442.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fuzirurikozujimeg.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0560d681---55809825208.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aac83837c---98072161464.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/remadalonuwoxewezumer.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ns3ddvkarjbf7tn16gu4qn6chh/zugepogesurusigoduxi.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cbea2857---sewivolafefu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3ca3e4ac4078288c129888bbe19553d6/90393675330.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fafiwokavudobetajutoliv.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/36093862449.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/furesukebemanajuvus.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160936ba90b780---42074794577.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021517935183454.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dje78rbrg21091g14pv52smri7/82380018047.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061501430170554.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dc0a0215a61060de848857dc6fa75761/80846795142.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/imdj3k8kv476meev5bst3h2r69/7921358009.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59ae0dc9a---37666464760.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf0a8d2a5---77163354036.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/99218219349.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a914435de---85142604779.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/zatizizubusedajajuwepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ccnp+security+sisas+300+208+official+cert+guide+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001573f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573F 17660 bytes
SHA-256: fee3162864661a28ea38dbae2406a16ea10ac4b38fc7bbd0c41c6ab49e4f91d2
font_01_sfnt_off000170b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B9 18276 bytes
SHA-256: 4fae2f08baff6327e0e18877084870e4caedfa2cf6c911be7a58cb8303a828e7
font_02_sfnt_off0001a08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A1 11660 bytes
SHA-256: 2a946b20b37a4ee587c3e2aa0e2eb6ba163a08c7a9d08c3da532018b2e0619be

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