Malicious PDF — malware analysis report

Static analysis result for SHA-256 368eb8d73f564906…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 09:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9da7ab0b3f4349c0005b7c22af1d0b2e SHA-1: 1cea409bb20f02815a130e8abd9e65ceb2e0b646 SHA-256: 368eb8d73f564906be14d1d79761c23bcf22877e0db77031a2fca3098e80bbb9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b1798c902589446efad5b6fe7d135546/dubufewigemobidimezuza.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/50ac775ee23d31e1522be6fead4d96b0/kusiv.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/93353964800.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7cukrbptn3r9n25al3bp0rcng0/33247598193.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/52465872467.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0ba5f12d5d971852b1d92c802c15d7e2/81541887500.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/ridoxewenuferumelegekife.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/lapuxufixifukajeta.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/lifemirinusizikosasupar.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2bdde8026bd6ef0e44e5a61f3d60ba83/pufudolusajawiposakuke.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d685cda882be684c0970aaaa6de72427/zewezibazazibokejesu.pdfIn PDF document text
    • http://getem.eu/files/file/vavav.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/42744582112.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe6f77b17---korawamipitajukatuv.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6bcb3922d5fa5d3e7598e6bdb0d93772/92860715769.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/82826820376.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2973ba738a2994a789010ae15a62ca61/58872283839.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/85782c5dd00cd97bf89c40c2f9713e78/85096147412.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e455c6dcd22---10577075496.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sejugamixotese.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/forebijajapivabuwirisur.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lajemek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=soft+reset+droid+razr+maxxPDF 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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10600 bytes
SHA-256: b69ccdfb4db8f3ee1f10c5022bfc3d5dd71c626005911bbad6b7c4dda0aea579
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 17636 bytes
SHA-256: 8e31410d683b7c047277231038db85e8643ce15839d67a39fd4f02c8de1051a6

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