Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c100e31100a1de…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 12:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 96230d30c24c6c1f3caf3323a600e3f5 SHA-1: f23a63bd6eda1700f9f9a4e109fe51f2161098fd SHA-256: a1c100e31100a1ded133c1f7ea38bdf86be08cb7b091c473e298438828a93f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs and is identified as a link farm hosted on compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=answers+to+biology+corner+worksheets PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2c252ea4---luzovemobelexusinafaka.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bfdcc8b---20721729754.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/majarejupun.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609103b101ea9---31430425381.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k1huf42rm8c11t26c8n7i0t1aj/83452714522.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/12204922955.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/walules.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/de9560d80eace1f21ede1b9a5ee8ec64/litesizunatagitujovixo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fomijegunusoruserovaji.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/59185545796.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/4230110917.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/93451593485.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5oio56i9hlosfnp16t1nituta4/fanezogikisowejaluvudev.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/38673b28c775449bada061cbd0b007b3/77231450840.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/91669401350.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075641b5b96a---88434831563.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/97257838419.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8a7f00e501d1a2bfbcfb66e04e99c037/38667154188.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54476725728.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cj0emttqueo667od2lthahhfaq/75025577733.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/fonusul.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af2949f27d87f9e74b542df66109e13e/vasalop.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/20359531732.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6ae426a632d1e7f662a6b1364743882c/jujele.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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16712 bytes
SHA-256: 9393083adc46f334b3f74f18b1b4df65048853baf7ba7ca3650d6f4eaf66ab4d
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 10760 bytes
SHA-256: b6cd5f32459aaed0c2f1126cc5199ecece04fa01dc291ba9bf3392cb3b07844a
font_02_sfnt_off00013bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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