Malicious PDF — malware analysis report

Static analysis result for SHA-256 2439eef68472db2e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 05:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 91586cea773a4ecd81dca49bd2f1e890 SHA-1: f92e0e61ebaa8acee41ab326133f3b64a0fd6f80 SHA-256: 2439eef68472db2e3c9dcbaf63975f08760d2ea3eb3667438ca1c6960f2859da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating a malicious link farm and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a download button lure and the overall structure point towards a phishing attempt to trick users into downloading a password-protected payload, likely to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iqmuseum.mn/uploads/files/mevewezugapojoxusewimet.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/bonifulekitetur.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/soripep.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/puvenoputuxizalim.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vetipuzum.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7d88ec33---mamefirepilizosatasam.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vozejeneviwome.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160814b810503f---redapejefitawato.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/64735815826.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd93d9f3a---neraketofuki.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd993ba0de0---wuwuta.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/tanenanoba.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gatuba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d50b039a3---likewavu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a8ab8240ef08e0a8ad5e6290858494a2/ritajunegasajeradusijo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fec0c547ddb---46065499772.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca331787b7---zizul.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/dakutunizew.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abec2beeaf---riwawujotizukota.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jv70o504q4jum7b7q3jpncgo90/zodubavobijosowe.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/52285796777.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031111137466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=registration+key+for+4ukeyPDF link annotation
    • 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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 18024 bytes
SHA-256: 539b6f01fb112b4d0fa600b2ea7df5831c945d310477b07bfe4775fe9027ee6b
font_01_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10772 bytes
SHA-256: 25f78feb5da8937f5bb078f753150b751c5aad171031fe1ef0fb35b352aaec81
font_02_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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