Malicious PDF — malware analysis report

Static analysis result for SHA-256 257a118b4f4556e8…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 06:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb3a335eefdf26b35df7c8e751ab3c15 SHA-1: 2e1526a2e1dd69685aff7b3178dd93575da8f5a4 SHA-256: 257a118b4f4556e8a3a8ac1c80d512c73fc5dd3170519f2416e0a4b88eb0a467
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://amexeuro.com/an3_Uploads/file/wanafoguromurelaluba.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lazerekov.pdfIn PDF document text
    • http://cloverdiamond.com/file/wasobesikuxatapunes.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/63dsdtd3rpfgns72lvj1a0mr9r/xotigofutotunizugepepew.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/53901385358.pdfIn PDF document text
    • https://sadex.pl/fck/file/jiposakip.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fd64bf8a---mebajowaxewoxi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7fc600c18e1cbbce0b43c71b90d4529c/70439242918.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/tafuzefivoxoborofaxutif.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/14012931833.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70c587a05---nekapotimurajixositu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n77ggnmnb0ulhc5k70df5d0gg6/85246463511.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf0c4d21f1fa61a3d46771ee9035fd5a/vamasawe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058522d90e---pesapemar.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2c4eff0281ab740f290d975d1b0cec59/68758064195.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/58425373634.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a945b00c70---fonasotim.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qut5e104blhla0fvenfoim1ca0/zogezopawegixot.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xotetirunipab.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0812f5fd7d675031d8aa346f7f5dcda8/9563588464.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9817be6e941def90f1efa0d3ef3334a7/39998600815.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/vukujarebimojako.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/81203062311.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/janin.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8fa6ae522---pixedozawazobozof.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/83326269216.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pibisejijomemodekifupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=frigidaire+dishwasher+aquasurge+with+speedclean+manualPDF 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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 11152 bytes
SHA-256: c1f18b98094ebd3794f562121ab7d1892ce9340e2211e24626021d5933dbcb04
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 17468 bytes
SHA-256: f91fe75f833a4472ec42ef742934584224e4a1331abf165680990513043288e7
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1