Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3b89caff3704c9…

MALICIOUS

PDF

108.2 KB Created: 2021-07-08 06:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 754974375a09cce21e180c5a03c0a962 SHA-1: 191f64e259c17387bb85db7858629f84c2802edb SHA-256: 7f3b89caff3704c923a19cd3ee3c8407a6b0aeb8c966187eb6f1b7edd90183c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload directories. These links likely serve to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/80173651521e95fd586f5076c0bb140e/simojatet.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076111d83a76---vikobukipusijekapogozeli.pdfIn PDF document text
    • http://sns.hu/_user/file/93862159221.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/pizunitofivivid.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a203e9e0f---funaluzaleza.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160943f4378162---gawexuwirewixiwodog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8433okj2n985b5p5dfgdssp056/tilaxagu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpnnfdt1kpgm3ffm1bm701cabf/nikegoxapulefaliriganig.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7d4c5e37---satowoxaj.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/ziraxoraja.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a1a936e4e5462f69bd135759641431b6/47783410063.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lavazadegexipivewalifofek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6jbh6ur48uu2d341uqj8af5o6/97208810160.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/295bcc333059c4865e2b3517aba238ed/golofe.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/76736362364.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xidomesulelirurelonesola.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5r6pro5auepc891o8hjo1p7ns8/62428406252.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985baf94483---3783798798.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/lawuvo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a7efb2f---vomasitugamutat.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s7vs1qho9c5frsaviil6j44re1/sedegimi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/jipitur.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e99a02c4823f29130020fb4a082c000d/zemasuwonar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=balneotherapy+at+homePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 17320 bytes
SHA-256: 6a2737be6c282e8db31e847f622a618486e9e93e07772559985b79a34ae3fab4
font_01_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 10424 bytes
SHA-256: 55e6a1190eda3b401b0e7eaeb14f2725f7ed2ed967db2b16c23edf5d9ddfaa4d
font_02_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 21608 bytes
SHA-256: 3498de9585da572656fabf549cd2c00fb94d7dab5ca1b23525f6bc35b5287e8d
font_03_sfnt_off00017d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D16 2924 bytes
SHA-256: 772415732819333b9edc380e372b640e1a3c6cd1444371b7ee7ddec69edf4f41
font_04_sfnt_off000188d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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