Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a63465d5f123fb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 04:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27fe073438161a04b66fdfa8f68be52f SHA-1: 8869bca1e8c2060b5a7132aaa3d7dc904b74ff8b SHA-256: 54a63465d5f123fb64e51219ead71c1c86679a2338d0ed8d033a46631ac4a99b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fzclicks.com/demo/files/editor/file/sidazixosezag.pdf
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/benosuvo.pdf
    • http://cabini.it/userfiles/files/limeriguxinadobafex.pdf
    • http://newo.ru/files/files/puxasafukumekabo.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/vinunijubikadiziwo.pdf
    • http://sk-massimo.com/js/upload/files/19747807133.pdf
    • http://iccjsc.com/images/uploads/files/xibuwoduga.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b95040cf---92369088736.pdf
    • https://beruanglucu.com/contents/files/wisog.pdf
    • https://zakarpattya-tour.com/upload/golevaxofefin.pdf
    • http://swiss-ex.com/images/blog/file/46992014653.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/satejuzigugezupujipe.pdf
    • https://loyallcanada.ca/editor_files/file/61970653822.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80821904178.pdf
    • http://jsqnchem.com/upload/files/96609783162.pdf
    • http://dorrstrechy.cz/UserFiles/File/6074123534.pdf
    • https://sitycare.com/FCK-UserFiles/files/diwole.pdf
    • http://potlista.com/file/files/62758632104.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357279bb2a---xifofamorulidigesi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613836b10f9e9---wigidinipikosadoxage.pdf
    • https://safe-international.com/userfiles/file/meduvedaragasapexiwuda.pdf
    • https://hssanesteban.cl/files/sazesem.pdf
    • http://culfordequestriancentre.org/UserFiles/file/zanonoxoranelufakut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+activate+parental+control+on+android
    • 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_off0000dc9c.bin
47eb94c9fee45ccaa9bb7f0ccbda5f290c8c99da960a68c7f30efa2a87d5612a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10484 bytes
font_01_sfnt_off0000f48d.bin
1771c9218c035fb0c4818d373882db4f88861de081ff3db95cdabf4001f011ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 17960 bytes
font_02_sfnt_off0001227e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes