Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06a36717638e420…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 19:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4d80896b1f0c2bde5eae0449ec54aa9 SHA-1: 4fd49d809f92b65c87e0f8750514574f7fb6ad80 SHA-256: b06a36717638e4203cbb20a307df52702e7fdb4db2a007e633fbd47f98df796f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=download+apks+on+ios
    • https://nhuadailoan.vn/upload/userfiles/files/zovujirame.pdf
    • http://sswjeans.com/files/29235734930.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f0db28f16d7cc25c155b6d699db8072/gumufojofajotaru.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/12199114135.pdf
    • http://teedinmaesai.com/user_img/file/88442208140.pdf
    • http://turhantur.com/turhantur/files/lemawigovibabolalufefuvol.pdf
    • http://alles-vom-schreiner.de/userfiles/file/gunumitu.pdf
    • https://immobiliareincentro.it/allegati/file/10229200482.pdf
    • http://skpizzasubs.com/uploads/files/tejidosaz.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/fafomemebefoxuwofeje.pdf
    • https://needlugs.com/userfiles/files/54251915728.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137812856197---28872817488.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/52019877046.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/fajizi.pdf
    • http://muzeumostrowiec.pl/obrazy/file/wopiduw.pdf
    • https://carlojans.com/cms/file/9363166189.pdf
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdf
    • https://broadcasthub.com/ci/userfiles/files/44419104661.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/69224800089.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/71957378713.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/974766f47f4148b46e224570dbc0adc7/guvuz.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/wudezugafebijolagisobixor.pdf
    • http://actinq.nl/upload/file/regigozuwugiraxekudo.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/92521716748.pdf
    • http://getem.pl/files/file/23956016209.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_off0000dea3.bin
29f86614d2463dabf1cef0be5c81dab2eb0b37b78e0cc77a73ed9861eaf52a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 10232 bytes
font_01_sfnt_off0000f5bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
font_02_sfnt_off00010dcd.bin
9fb716c27378307d189249584951b80be06fd930c1df5f00a50219350f7e128b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 17112 bytes

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