Malicious PDF — malware analysis report

Static analysis result for SHA-256 4804949876cb350b…

MALICIOUS

PDF

90.7 KB Created: 2021-08-26 14:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c21baa537ffbbcc18e9c9f980d6cc81f SHA-1: 85ea2f9d6f2c4bddc941b10c5c1e3018adfdb064 SHA-256: 4804949876cb350bdbe75a0c0eece860161f8d2034ae4fd59a96ab25b51e7431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 link farms pointing to compromised websites, suggesting it's designed to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=roblox+arsenal+melee+codes PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/530e970d685026f9bb5a271c21bfec94/8083004090.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ea4651e38457bc486f7e58083192fb5/toxuxogaf.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/84237479951.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/ponepatutu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dfb8a3308---dirolatuturo.pdfIn PDF document text
    • https://krusomying.com/data/file/kixobizopiwopot.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655b7268d6---25674644924.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb59b44c2---36028348655.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42580d16639e95661f9c0895eec243ad/30421078085.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c95e99e7d3---dumapalopokusozelejaxi.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosejoz.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/wiwozusurupojibosujupimix.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/81f9277b61718f0b1efe1b5ae45ce902/munokopulewolemakurikekuf.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2997a6128964c47181dd78d61c178f0d/1659495457.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3d3aa41199531c1b48595118868d3b49/77642030207.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/raburadutokupub.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/rumenavojubeji.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/9272797206.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/gifoduxajudawuzakagajeb.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/mifexovekulukezezagovafol.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/38077230631.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210823_224419.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160864aa21fcb8---bomokapulajezan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10628 bytes
SHA-256: b2be3dc45840eccf63eb732910df5b177f73f89ce9889470e2d2e154cfd2ab2e
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 17004 bytes
SHA-256: 550ccf1b47b355073f2f3ceab847ceb71bc9eb26f7363302765c988de16cd950
font_02_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_03_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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