Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd27f591acf5704…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 03:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2de984326ce8badcc4d55da47c94c563 SHA-1: 0ac9800bcee67eb4cfd3b42738b9c4de04a6f0a7 SHA-256: 7dd27f591acf5704820090f26b0a4c9422d882b0f6fbbfab7d9c1ff0b2272687
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://dreiseengrundschule.de/files/ralagibapapazipiz.pdf
    • http://volvo-cars.jp/js/upload/files/75838152186.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/sorinijugumedika.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964490ca9cc---37061730534.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc602c41ab---23399128902.pdf
    • http://wych123.com/upload/files/murewofazufo.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b404529d2---93037443157.pdf
    • http://www.ondebiz.com/userfiles/file/nokoki.pdf
    • http://thietbimaugiao.vn/Images_upload/files/piruzami.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5b0a99f534b94b5301066b3986e7f6f/lufepujo.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/68003594477.pdf
    • https://secolink.sk/userfiles/file/mazepavopuwilala.pdf
    • http://elfast.ru/userfiles/file/11935217019.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09287bee18---75672765644.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a1beb542fa79a118bfd96d4c9323335d/46188785316.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcd24dbeb---43621847512.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdaf74ebd---figemawajivolixegegeje.pdf
    • http://curry-box-deluxe.de/userfiles/file/wakatofusidesut.pdf
    • http://daoltrading.com/userData/board/file/67638599990.pdf
    • http://tlproduct.com/userfiles/file/moxevixuxodeti.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/30173215034.pdf
    • http://aj-logistics.com/stock/userfiles/file/47605008010.pdf
    • https://dm288.rs/slicice/file/xetopaziligiripak.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9j8fmi8g45a2ri9n8e94spai0d/41061769565.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u854si0l6ib3m195d5rp5kkk54/xupijul.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e27f6f01e---wexejapovipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=orden+de+los+adjetivos+calificativos+en+ingles+pdf
    • 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_off0000c295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 16792 bytes
font_01_sfnt_off0000daa7.bin
1befd6c9c2e7802f77c004b74f5d14f9a3e01280e7924fb746c4d5debf417a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 18416 bytes
font_02_sfnt_off000108f3.bin
0fa3f2b8ce829d06ad289aac3eb24ee2c56486ea1a1dcd7480c64fe52b4cf54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 11016 bytes

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