Malicious PDF — malware analysis report

Static analysis result for SHA-256 911b9b61f4eb761d…

MALICIOUS

PDF

82.5 KB Created: 2021-08-27 16:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d95c6bbd27fb0b8d06900862f1c62af8 SHA-1: c7575159868db0165f0e7fe47f9ced88a1fc7bc0 SHA-256: 911b9b61f4eb761d2e9f1d2716398ec30c622aa87d5741e563c4a159756773b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=irs+standard+deduction PDF link annotation
    • http://angelofthewinds.org/ckfinder/userfiles/files/xegegamipimenati.pdfIn PDF document text
    • http://offerparts.com/upload/files/79763455658.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/38621284486.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/jomaxeli.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/72020917263.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pukulakemofidogunepu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0611538a129d5dd6f2b2252809d61b79/89744446536.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/06cdea44031ba1b90d3f0ac9c01899ce/lavudanotusinuwo.pdfIn PDF document text
    • http://datcat.vn/2018/file/butiwotojitanefubeloj.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/19660191392.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/af3fc5fc31d317ba9e5188a94696412a/lajasomimetepovudugus.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zudopuzefegu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/pojilakom.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/75470958013.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/600de0655dd23e38532f57c171d7956b/sedubizejegutaxeravirime.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c52d272b9490f04f7d9c1d956c016a5c/66469532702.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/muwuzefon.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/098f59dc95edccbaf84b49654fcc817a/98065906803.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/vudorit.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/34053680486.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084560f4d648---68821864047.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/69ae7fb45109485de99bfd366bc8e170/21273939237.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/mikuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 16632 bytes
SHA-256: b0b7270538c5050ffbd0dcc6f7449715f2fb64361d19bb012b889a9869a65f92
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10368 bytes
SHA-256: 35854baabd62f4f4815df49d6bdd3f5703046973d00b1ff7fe1910c2799ac55e

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