Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6c4459ab9ac97…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 18:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f726c4637e3d989aad4d4ba485067bc2 SHA-1: 68c77bdb5cb71fcfae4aecca86ded9f7a5dbfee8 SHA-256: 8ff6c4459ab9ac97d568f2a27b0c94a1a532ba95b1d5356ab28b50c5f37f8018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external links suggests a phishing or malware distribution attempt, likely disguised as a utility like a PDF repair tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://schmitz.cz/res/file/tatov.pdf In PDF document text
    • http://schokoladenbrunnen.de/idata/zutuxatasepinejanur.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wasonebemunopigeraz.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ba7cs3oj7d9bjec5i6cc0n6fvm/85189828086.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f5fa1a95dd3d9e331ae443ab64da028f/radiwupixid.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b5ih3kcmpin7g55ned6qp97n62/genojovapimofezilinufil.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/vavonarabi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9e411dd45d1e8f3641eb16b9509830e0/50283588899.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24427362956.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/kudabawefowis.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5584cac78---61141181322.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77391a33c---41352774021.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/13937710524.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae595a860---kejezenofelodil.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0873438d0---pibeloturower.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4baaeddc658ebdb54ed6370c2c0e5a06/36218469763.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/48863632059.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/132495471231dac54689191fa20c8a6b/60329239410.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/63504126400.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c88110d39f87401cdafc919460f9f4b/wiwoxododomuwod.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/c93gmj6t41q44cdd17ji94f5b4/9647725551.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6f885ae753125f85b274e1e3f056d511/nuputopeziluv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9b4d2c5---94787912142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+repair+tool+windowsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10580 bytes
SHA-256: 6a54c9c67b16c5d1088fe47c825086bc355e0a96d25ccfd69365d48a5634ccae
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17740 bytes
SHA-256: c8f63314b8f389fcc482e4a1b22230b1495c5d0bd8b011b545b395b00f6e240f

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