Malicious PDF — malware analysis report

Static analysis result for SHA-256 b478d6f614dbe954…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 08:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4d95d50fb8d502c061472cac73e50b8 SHA-1: a21193e64f64df92bf91d5bd4138772c4fd650d1 SHA-256: b478d6f614dbe95406230dde8493caa0b7cee4938f857c38ed784cf0a2c2c5e1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs, despite some being marked benign, are part of a larger infrastructure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://occahomesearch.com/userfiles/files/lagilegawufip.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f4b7e85b---jumefutudexojolebu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e180418a9---2652003161.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/4179674790.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/32360418510.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/xarivevavavibeso.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32752261741.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/60f823c3cfddf8cd507413fc3f9b3287/liwafidapepijuvotojujoj.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/77677860509.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f0237e2c2c3cd0d9ef9fd47e5d558e5c/57894938176.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/af1657c95df703eea0fdc31666485f20/mowelavifirer.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/79487798501.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/60577282032.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wujujuvadab.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbebc34ea554489248b3b8a23155761c/45045285464.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911f3aee33c---pugituluduzosufusaxur.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72610863262.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/emouuklkg3ahaf85jnhtshktcd/85967315953.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/xugesotofudixakawudufetob.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/18539578124.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/mopejarekedirugumevokaguz.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/nisobulorin.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/72379730156.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108051349502221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=c%2B%2B+programming+for+absolute+beginners+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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 16336 bytes
SHA-256: 118c34a95c0c37af2c254c4bf8f9727ab3953603ce7f84a5069748852f9ec195
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 11112 bytes
SHA-256: 10c8f8b4e8fcc230e378b111e4f6bcfa2ce6405a59a9e49a6c02921e7994c0d7

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