Malicious PDF — malware analysis report

Static analysis result for SHA-256 4538ecaeedb0f37a…

MALICIOUS

PDF

110.0 KB Created: 2021-08-04 02:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d59b7a3e3cedf0843fd1b3d14818137d SHA-1: 49d5d5aa9e6e7a87db6cda997051d5ee38018129 SHA-256: 4538ecaeedb0f37a669272f7a211bfeaf556cc2d5a36fea3928ece5e17e48445
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of a link farm on disposable hosting further supports this. No scripts were extracted, but the overall structure points to a phishing attempt using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da92192ba17---wanubarenelusinewajekazek.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072411551372956.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/dowafavedobodepiwufubifir.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/86517362633.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7970a281---66324364460.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/61515088345.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/paxirukumaxokenufunarijab.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607be035a4706---91186226874.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4d6a2a4d---meligiwetisuluxobobuwi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6ce7a426---23039460762.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/14568447585.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/9956952408.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/wivekotedufavoju.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a718072b7---relelutovotufuxetopiwamim.pdfIn PDF document text
    • http://axwelindia.com/uploads/wirutaluwojemoveseroj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892a3c143a3---80752962259.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb007b210---83632486221.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b758ced54d---25326063383.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160826b5f364ba---79978794498.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/79179015597.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c73fa17d5---57309861706.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459febc5c0---19039472015.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/45929667528.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/92389822167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+does+the+whispering+house+represent+in+the+rocking+horse+winnerPDF 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_off00014973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001618a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1618A 11016 bytes
SHA-256: a388ff0daae7525a8ddc635dae7bd61571257fb1d5fea9d86e22477aefef3451
font_02_sfnt_off00017afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFD 17424 bytes
SHA-256: 4f4cf4de0c708a776778af60e1c493e9a912e0645e838bc57d04e098ac842b3e

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