Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ba552f16c55c0…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc0c9fef5aa31ba4988d778d85e388ba SHA-1: fa5a814a892bf494250961aab5f6d3f41b77a029 SHA-256: 718ba552f16c55c038ed26aba49f11cd77b22d6d845b25858bf8a5de0d8ead72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The structure suggests a tactic to obscure the true destination through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/c27e5b9520c06bc1f581baac39a7a30d/76284715430.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608460751cbfa---77021808824.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/40sprjbctvs2ru5ak55i0cfom7/99812855083.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9872ed9ee---vudisovotakedopube.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/belogubuzusitejenivame.pdfIn PDF document text
    • http://envigest.cz/upload/file/gavudixabilizokitu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/07e93dcc9e02710d14e6d7455ed27c98/moxidexifituker.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fbdb3dd84---kekatufofa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/12753d0347cd24ce3eb333a3581a50c8/59806820988.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kagomuzupidelavuzasofu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zajipowukujovo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/50785219122.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7107204000---87964237191.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68125053837.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/57121090187.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-13/20210713205405874575.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/7040316174.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/35917080933.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e63430247---93830554764.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2n2uatrnc1mathdub8tjn6qtpk/74655953979.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nutobozovo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1f1b17f76a2fdcb12fc00e8c7ee97f32/19536888285.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ff73e45502d38e935dbf7d9999943510/xexulutedomuzojezir.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0602614dd3---lubawewigoxovemuzedipazef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hyperx+ducky+one+2+mini+softwarePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/madisonesedukewatozegis.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_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 17588 bytes
SHA-256: 140939be6a0f3f7d97c2220b508ee2b55d70f43a4b6f3303ca874ae33287049a
font_01_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 11340 bytes
SHA-256: f008a8fd40c36d92c1c664986f0531f80dc7da30a6d800d5e8bf49c8d09f6fa7

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