Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2ad0caadb0d289…

MALICIOUS

PDF

108.6 KB Created: 2021-09-05 02:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a415ef498526948dca72beb6acbd671 SHA-1: 810ee321efb59e6fb5a9152634d5e435e585efe3 SHA-256: ae2ad0caadb0d289ef9ab506c31e798ee376280a915ebcf40308ac79a0198696
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lacaune.hu/userfiles/file/fefujisazasele.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/93171158265.pdfIn PDF document text
    • https://huanghecables.com/d/files/pemapenosexa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/bd303db0dea9af4f99769b09b944475c/defufumomosusudukabi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa784a4e5---wemebezitokos.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/wudopina.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/sujudamukubesomesik.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/999de70837fb90a6ce20f5bbb07313bf/38214901385.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/silosikezuf.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/kanelogek.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/damitifakuliro.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5abe8920---nivibegonifowigifukefifez.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/89828390143.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/zupidopawisusawu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/31937510046.pdfIn PDF document text
    • https://media-get.com/userfiles/files/39745663108.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mipg68rlit2agn5di5j808fm4/77338386304.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/67460363664.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/74516334470.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5bc77ff0---gotonin.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/48040879612.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/49868991252.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/purari.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296510a10d3---dogadagajuwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=physiological+response+to+oxygen+deficient+stress+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_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001580a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580A 11116 bytes
SHA-256: 8352afa22eaccb988396f14175e8b869c84253c9fbd704e448e43f611e6fda70
font_02_sfnt_off000171c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C8 19204 bytes
SHA-256: 2fae955d2eba2f8b19a9807ce5d45f3236de659312ecacf607f56116360f15e8

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