Malicious PDF — malware analysis report

Static analysis result for SHA-256 282716ad6b238c78…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 06:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87d6f7afd0fccbd817d565a250bc34c2 SHA-1: 33783dae7446c7ca59d13c566083e84517a576d1 SHA-256: 282716ad6b238c78df0537bfed2d2265420c81a3763faa00cf2e6fff189ba932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=multiple+office+365+accounts+on+android PDF link annotation
    • https://ezsprinting.com/userfiles/file/82474137824.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_180137.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210909_223627.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/dotetadukemetosa.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/dibawimi.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zuwumilemosojunama.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7544e1f14---vujanul.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/42890841853.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051048015739.pdfIn PDF document text
    • https://turbooto.vn/upload/files/rasawesugutigituvi.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/kujeduzolojalavujugod.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/refuliloronijix.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/80755503467.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d466ba6efd---keberibelininedefezefuve.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3f45724617b80aeb80fbb93000521217/88944193046.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdfIn PDF document text
    • http://budka39.ru/files/11831087509.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gaxanetevobomomeripezego.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/filizowis.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/newokuvosusej.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/fuzob.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/74835590646.pdfIn PDF document text
    • http://vswet.ru/f/vaniro.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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 11180 bytes
SHA-256: da355277cc172c969cd705d8826c1bfacd1d9e37ed344174b314f868c3c9dbdf
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 17248 bytes
SHA-256: 8b4edfcdb87b3debaf66e05be2221be9df3d101758185560d9ab7a67a34fe8d3