Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1abb5f7a7ad56e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 13:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455a7bd2dff9843ce42fa45fe0c1853f SHA-1: 10c27471c84667019b5c3441de731c158a2b2f28 SHA-256: ca1abb5f7a7ad56e81852c6472b2e1652bf66aa1f2552c40fde36b36e338f261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://beiwendq.com//data/attachment/file/38647977015.pdf
    • https://malmospelmanslag.se/userfiles/file/bogosewuzazewabovubaluvi.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i00ij2b3ji7qh9qq90s546g33u/vasitosopuziperona.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfbituc3kgg3s93n05gf5jtosc/84854823401.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c84ee1691---bikalomatololofujuripimow.pdf
    • https://alajuusa.ee/media/contents/file/59668654158.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q51f913ojh8ar867f61rt8c3th/retugamekufowi.pdf
    • http://babamoleskine.com/files/file/jevalidenawetupaxufikuj.pdf
    • http://michael-dhom.com/webseiten/file/50421302541.pdf
    • http://pogservice.ru/userfiles/file/kezebomizeziza.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3d50077a---xekutoralizubusofujib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a1446a4f0---28407184109.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094f68426dc5---mamifipewabigusebipok.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/51516304794.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25c76f901---79692762472.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae146e72---vukilidifu.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8daa83b13---birad.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d6f9650ab248c9174af1f99591a531ad/mudaduwopoperiguwadom.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6908c2fdf6---vebawizesufabivesemum.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/631515e490326e33ae90b035f99d7fad/13425653195.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161236f5081cbf---minatoronenazez.pdf
    • http://kruengrangthai.com/files/files/kezijedidaza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=statistics+for+management+science+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_off0000c087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 16792 bytes
font_01_sfnt_off0000d89e.bin
2becc36dc9bd217ba7d6e7c26afa282de268e1f61ff7071b31961a9a06a73031
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 10992 bytes
font_02_sfnt_off0000f1e5.bin
91f0a1662ca63e19e277b39658acf6c3c4fbaa4bb6e8213b8f2bfab2f7e082a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 16692 bytes