Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd03b16fb1967880…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a274131961eb4fe2b7ecc00779e2b791 SHA-1: a6962a58bce58cb5b6634da642ce3ad8b793a4f1 SHA-256: dd03b16fb1967880b2decc19ccc90d5654e97809a677c49b41bb2bf1acd17d57
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=linear+algebra+4th+edition+solutions PDF link annotation
    • https://learn-atdi.com/uploads/files/wujofedi.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/25507493917.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/kamanut.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6bb3a7ac---suvezejezujugidilopo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109110516485840.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/83218033672.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hb06depagl4i2cs5makh0r5fkb/61955151787.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kuvubogijumuxowesefugulo.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/wutototadisodixuxipu.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/68653247137.pdfIn PDF document text
    • http://na3.it/misc/file/22914104842.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907225508.pdfIn PDF document text
    • https://coluer.ir/documents/file/70071800964.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/53156048350.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/85745093977.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/43852036660.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebf05b529---zufepigo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vepabimipubiwoximav.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/93ba05ad500a7cecf0a530b24cb2fc3b/botezowisenaguxuj.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rarupo.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/kofuwevixivi.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/24687688623.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/wedesotu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/nogaxabafig.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/71682417012.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_off0000b678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 15828 bytes
SHA-256: 32271ed483d4696aff8fc4de1492f78d55d99ec3eb9989b076e2417a761eae32
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10804 bytes
SHA-256: c4ec473d129658bd94e809ca7e6b263511a547f205a89ac814efafd9a48eb235

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