Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1f58dc606675ea…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 03:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32cbdf6a2068f82e3417826eba61618d SHA-1: 3c1dd84d7c0012a40a176af81612be1ae8eebf35 SHA-256: 1f1f58dc606675ea9e02637558bed4d388bf00582eb74514ab72e8cb3d52cb86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be spearphishing attachment, leveraging the embedded links to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=how+to+watch+fifty+shades+freed PDF link annotation
    • http://falegnameriacastiglione.it/userfiles/files/47302963112.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/34394865106.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c0a725b7c5c13fba803c886e9b4884e2/95019864939.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/fasimabisuvaxujugu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/80585705577.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/doxotiboxurubezuru.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/zituranuruxexupuvilid.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/40987976863.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a1071d5a6a2d7f45eee2c62b7cdf6a1e/pixenogosi.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/rodonoduwajuni.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/bopopatorujevezoxus.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613914d716985---dewukuvobup.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5562e6d0e24f62e08e2eca524a1e74fb/suvivarimibopisaboluju.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/fusozojozukun.pdfIn PDF document text
    • http://thaide.org/userfiles/file/50449955267.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/51322252034.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f8b9e80c68b72ead80b6da446a856b8f/tunaxoxejibedadunasekez.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kodijumovutexozoxujiwomu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137267c68407---39602846157.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/visev.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ee23c62d---32152286962.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/62166938039.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rifezunosubagela.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10616 bytes
SHA-256: 02328ae5dfcc883806991144dc976f25fedcd69b78234874b28ca980a716d76b
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 19288 bytes
SHA-256: 6e0bcb0a97b8aeb6716755875a10566a37b3353cff93c87ecffcdc9364928e96
font_02_sfnt_off0001404d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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