Malicious PDF — malware analysis report

Static analysis result for SHA-256 32eff80a24364f4b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-04 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6420c934dd87571d1efaf103d335b514 SHA-1: b653d630bc0b3e2e52cbf12e25348ebd81f8f87f SHA-256: 32eff80a24364f4b8a797191e353ab95b524bebdcbff13e46a342fdc649accd9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9jajpht6jfks1mbataobiorh4k/41948718267.pdf In PDF document text
    • http://quangcaosms.org/media/ftp/file/50366610443.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/39074720600.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/jufuma.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac45d7b4f8---niwawixu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/01196ebb1ac83598a434778e105125c9/9296381945.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5fc2ff2b0716602c3136dd577b786e47/jifaforovalobusiposo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9ndqfo1sn217tif8sc9f7ilpvp/tizenokogi.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/zuxalarom.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1099f622ccc491c6167d313fdbddf53e/74519636434.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d7027693f3815af9e27c8714c3290353/sazifogudufegededulirav.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/parapufu.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/80661976795.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1ec48b9d340e578be2aea79009e3b1c8/buvid.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///27341510280.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/dabolabofisetigage.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7435c4a1d5a4082df05253c9c5e793ad/38666947765.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/7163398943.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/shpppbjqtgse8e1p0nnhpfh7f2/jatebiseronoxu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9dc42e21c39e4d1ccd03868d03dcb57e/soxunexure.pdfIn PDF document text
    • http://artospace.com/pics/file/54480614354.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/04d69e8eeb4ce0ee9abbdd16d79dcbe0/83354864473.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8747d94e0e4a65504717b487b9e280ae/kevulin.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/32228719948.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f79bd3eda---pegegezizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=naked+male+showerPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 10376 bytes
SHA-256: cc3e9f1add35acb48c1595cec4e23ca7e0888c64c18b0050b27bb85da741b631
font_02_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 16368 bytes
SHA-256: 70ef9714503042463d12baf107aae1c7428f0254afa42f09d3b7ac02bc577caf

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