Malicious PDF — malware analysis report

Static analysis result for SHA-256 1801aed62e087a24…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64806dd555c498e816c9bd10808f6eff SHA-1: d8016d2162d328950cf9dfd74dd898b09b389442 SHA-256: 1801aed62e087a24f7717ebebf125d4adee3d7884c848ad088eb78055adabb5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=cuneiform+numbers+worksheet PDF link annotation
    • http://a-pro-peau.fr/userfiles/file/tepureburutiworej.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/59201240672.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfc5c14091---22967215823.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/bugiritotemolomuroba.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/45110054642.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/nefexidu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c4d5ee1239954187e2890eac52e6947/zewafujetevif.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9286d6ba---fumifatubemefag.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vobqjbhd7t67ou7shh6bm4g3h3/zemeviwakabokukivanagepop.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/1004439112.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jimatazetelolasex.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878a75476e---74205083859.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4ca0d9437f86ab1905ff38af9dac492a/fogabupewifazakukolod.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cf55fa25b44468e2074412d54e97e66e/8375794871.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vodewevimojopuvegu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/42355236047.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/84493154534.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/75462151690.pdfIn PDF document text
    • http://zerosquareonline.com/file/vebekodebopebogi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/mabetokusikulewe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439d56f4c9---mulukotukabavop.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/66589247840.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_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 10720 bytes
SHA-256: 5fe390bdc2d23fbfa22381c64df343a30ff354fdfde49934a5b5aee3c755dde2
font_02_sfnt_off00014124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 18380 bytes
SHA-256: 9e802a5126f620dc48167602ad10dad38e2836e3f513d1236c1433de7513d52b

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