Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cd458e06ae00fc…

MALICIOUS

PDF

126.1 KB Created: 2021-06-30 02:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 908aa0fc1b06af817e701e939dd4bdec SHA-1: 2dddf5b7e99d94b053f84d0e0c9a22fc45a944e1 SHA-256: 78cd458e06ae00fcb3a5a17349b23d6c516a3502518b75edf1da1885327acdf2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://csc-0411.com/userfiles/file/20210607162536_t29pkm.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/59ddfd98f16b43129dd0272fc106e0e0/96114910393.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a10e8035fd0460af698996196ce6057e/97897741992.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2mbu51au6l4lgqomo7san3ilov/gopevorodu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ajjshnlqgr8h7i0ce0hrp1t96v/46790414780.pdfIn PDF document text
    • https://rosycaffe.com/file/10414208424.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/54701120289.pdfIn PDF document text
    • http://short-story.ru/upload/file/ziwifegimojad.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608756366ff8b---barazowosipixupedexose.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a207ab909b15eb9e597a44cc91c49575/pesegukevukabejaloj.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a6e59e36---kajegorijorakevudabutev.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24126b07fd---firawepowodu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/10097561601.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/76504891491.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e6a69a6ae27ca67a02270debf77fd72e/tosurakubojo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aafac132c90---woxegulelifozibigus.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ffa32bdf202c34cccf68458a02f6e5ed/72603740849.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/26088574357.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/u13q7tjhpc4f0644mr9f3bc27v/25897759795.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/96311499603.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d497ae98f---bokulenaxuf.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r93i13juhurug5ni9tbhqfutul/2975022431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=biblical+boy+names+and+meanings+pdfPDF 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_off00018abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABE 11072 bytes
SHA-256: 0e51a4424934b566cdf5adae8ef25020f0be0b88100e0398887ead16bc2d85ec
font_01_sfnt_off0001a422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC34 17936 bytes
SHA-256: 45c5e72ecb072a215244e6bc9d7e7688e407dd3dd71aa2217ab8612b8bcaee5a

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