Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb8181699b5b534…

MALICIOUS

PDF

98.6 KB Created: 2021-07-14 02:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7476f28849619945649a5a62076f5829 SHA-1: 9efa632241e732c1dda47167f9840212c3cd3f39 SHA-256: 1bb8181699b5b5348d7c10c1d44ea569f42911cd8471b6f775ac1d8aec330ad8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://staceyasp.com/UserFiles/file/tuxewomu.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0mtbkasm5abgvo6uiguhqjdhr6/jiseruwigabadifujelas.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhs3o6oaejorhicm3iv5gfp24g/gotemazoxonurasalir.pdf
    • http://biosite.ru/images/news/file/11250479970.pdf
    • http://abogarestudio.com/userfiles/file/zudidejadovuzivoxu.pdf
    • https://inncredel.com/uploads/60309727115.pdf
    • https://seikico.net/img-tym/files/598185346.pdf
    • http://sevimticaret.net/userfiles/file/99703213934.pdf
    • http://akinmedikal.com/uploads/file/dizitedofasasoso.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/vudutatiwujalotatopinatu.pdf
    • http://summithigh75.com/clients/867147/File/lagedinikosoxaxavitifatom.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffac3d4b---xofave.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9830308481966f5902157617558bfe33/15738507686.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/a32b2c4717767c5703f311bfd2f3bff6/86216848349.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/09hjo6k928r9ut8qhecdpuuef7/ferifebupoxabuluwizemude.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vunajojemukafapewezibi.pdf
    • http://vandientuchinhhang.com/upload/files/88440176699.pdf
    • http://akvari-um.ru/userfiles/file/tonapez.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/22d78b90892d3d9fe63f76a3241b52ac/5644136823.pdf
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84ba74788---59572082158.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608366b2d8c94---45806863669.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d8d771359ec388e9c134f139b29acddb/wozepidurosavixopir.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/13a37df3232a27448eead8612e70f348/pawedixozadomewanuririd.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+conversation+longer+with+a+girl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d44.bin
68e4649cba106c51097c3526011297d3441aceca02dba2248600772e7944870f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 17224 bytes
font_01_sfnt_off000149d8.bin
7e4362cdd37327ddf81768401ce3cec20bc7f1fa95f5d55b3738139827c3673e
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D8 10912 bytes
font_02_sfnt_off000162f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162F2 16792 bytes