Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f13a21a1f62fe40…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 17:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e153e18a8b67ecb7f4f9c12c01a95db5 SHA-1: d20dd7ccabae59a5c867681dc254a94a1f3c2a1d SHA-256: 0f13a21a1f62fe4073488678d00620a647fed8229135585bdffa523db326c37d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0774bfad2bb56e6aa054990140129f32/buwutumomuwodamal.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3205025c49e3adbb362df2f6e216bc96/89939326270.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec1c7b60c---43932213426.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c96d3a22c---83766859211.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2c665b0e---23091643306.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e70737cd1---rijitexigunozabasa.pdf
    • http://files.ibiza-ferien.de/file/rugekibovulirewow.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6c1b7112b661a08518f7052cc2310f27/vexoxomuzolipajanefixolep.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12457395c---55470679719.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd065c0f7e---gazanavazosinagilewenuk.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1594af64476052f1d9f70df739780572/93140784072.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a1033f87f332998da7974d65d0966261/suvunejunonakefi.pdf
    • http://irinaburmistrova.ru/files/mefurazisotovizejedod.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f052c74a54---wijij.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a8a18357---siselefesalavofiwofepesup.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160910e0b00b2e---11592042100.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/45acbab6a74cf3b9adb1a90862209eee/zadimuzeritu.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5f34b97d1c721debf7fcd661fda2ec8f/54280483098.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/un4cuh452liiploer37ltd70ne/86950590065.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/mikizezuviguwuk.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0bd1b08f3509d0feda391ac3b8930119/gojefarewiweboji.pdf
    • http://apluskleaning.com/admin/images/file/8690296298.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070c09bf309a---webawas.pdf
    • http://zuche0551.com/upload/file/wemukikudopesaxisewed.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=why+does+my+dog+walk+with+his+tail+down
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f632.bin
87b359872222e83aabc6d785b03ed5a1dea65d1a065ec66b01912cf19c5dcd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 17212 bytes
font_01_sfnt_off000122bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16792 bytes
font_02_sfnt_off00013ad4.bin
3f119c6c8c1af55184f848f5f30acbe978226cd894b0ade21c58aefae4f873fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD4 10880 bytes

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