Malicious PDF — malware analysis report

Static analysis result for SHA-256 be18b050082d1b3d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 19:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f220f98f8106a340bde6b980856cc24 SHA-1: c696a9aaf2d1cba537503541b903a8bff2405dd9 SHA-256: be18b050082d1b3db2b7214b830c073394e9b8f3b4972c00c1c9320e765a5d86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410ea6ac532---85579665032.pdf In PDF document text
    • http://usagimatur.com/files/others/kulefaxedibekenatelab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0d6d1d0f---nixojugesimi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/96744401337.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e2ab12b2---tomosilijule.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/21828092700.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/zizabenabosavun.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/sumirejikijupuxor.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gufezefavopipapajigat.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jowitaxuvoxixubemudizesud.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/detugel.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/36194308189.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/radiribezigalor.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/3091569182.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/vunawarazegapabidufavamib.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36058595940.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/34817090075.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fivosigagaliluloxab.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/vowujutodajesamexejelezon.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/ronoli.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/56580504980.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/vorepasi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68664d835---17946650842.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/xivoremono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+photo+maths+apkPDF 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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 10512 bytes
SHA-256: a19914bad1568f361c2ccd7669308805ceef04069ebc1f634988df6fe44aad20
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 18516 bytes
SHA-256: b5a925c76c3c6bf16cfc621983265936fc100b1ada85f476aa70dbaaeef7f2ef