Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf118a4760fad1d3…

MALICIOUS

PDF

101.8 KB Created: 2021-09-07 08:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceb15930155b8451811604eb2f0c464f SHA-1: 9022f4095d67529908ba3b920f2e02c1bde70fd9 SHA-256: bf118a4760fad1d3e57a1b069c07af6db3988a86c799884bda6675542747e30e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775823c6b02---50938188238.pdf In PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/55157485510.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b7df8ac34f704d45f83959644a0ebb8b/88685673709.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/butaxidisimosekepupuxixe.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/dubakonedafonamir.pdfIn PDF document text
    • http://brlairport.com/images/file/gadafiditisiwopojomud.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e89876bf---34773734014.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf6000d62---vabisofolelejabuf.pdfIn PDF document text
    • https://puppometalli.eu/file/83591674081.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/sugakiwisirotuwubixadif.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160743c80dabeb---suxilibatavafol.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/dopozezasuzenuxiviz.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/39376968281.pdfIn PDF document text
    • https://andrejc.si/files/file/78411489333.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/jigulopa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161270d9775533---54917451784.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/wofajobikowexorovigu.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pimexuzewaravotubiva.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarapemuv.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/pewopovawerokodenaliti.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8508ddea9e---dujelavobiwosuzakibogoleg.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/jifopakezigefunogodidamo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fezutufavas.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/27927895103.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/16438486659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=she%27s+the+man+screenplay+pdfPDF 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_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 18044 bytes
SHA-256: 9e72be73c57fa5cbe42a1db684bbaf4a249d4e2e0484d984f6770fe8c9457b4a
font_01_sfnt_off0001586b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17082 10896 bytes
SHA-256: f5f5ba524ae905ccd11af713d4ec201c1d385e4ec4eded42157b208027914e29

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