Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97c5d84bc11fa7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 03:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3600aa5405cc1a9b078d37e23780d248 SHA-1: f5e7ed70b348c800cf376b3a6d53e8962dd50ba1 SHA-256: 3a97c5d84bc11fa776e2997f6321e9889f84809001d50dde8455f2e4e4e40d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=12th+physics+old+book+pdf PDF link annotation
    • https://aletihad-group.com/userfiles/files/ziwuxisezeto.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5c6c8854cb8f2947c8ded44de9e43cff/77952147397.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/23651183893.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/60896431830.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/94786979673.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kemaluduselapulap.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3da76b92---pifonepe.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gibusukob.pdfIn PDF document text
    • https://dintek.eu/uploads/file/97643398654.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zixunijisiwu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/jamapitaxavijaw.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/nuvalo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xibajifet.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/50508968493.pdfIn PDF document text
    • https://majubesar.org/contents/files/tedozozekeratibubipatak.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ea447fc2---57171682869.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405effeca58---lidumeloreranez.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161429592f10a6---34131286533.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/suvumufesebuz.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/guninixumodejobezot.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/27075744055.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gilofapugalawajoxomuxim.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/wovawarudupovojifefofu.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_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 10640 bytes
SHA-256: 05252bc5c4ac1e49bd26e0653b46ffa89cc679cfdc9fb1d0e5d9c7da2dc5dafa
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 20600 bytes
SHA-256: 0e331a11f8a05cd286806508f739c339b263a7d923c77698cfd2a611617a4297

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