Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f433a9e525e49e…

MALICIOUS

PDF

94.5 KB Created: 2021-07-26 14:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63e78acbd4970096e660e233da8af8b9 SHA-1: e2c8b9cc413ab8fb1ead0d9c4dc6f851146c7e39 SHA-256: 57f433a9e525e49e5e89b295f35ce7deecc1d44bdc27382caa29e59b81792739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/58bacadd7ca071adaa9ff62e32e9df29/zulimiduwibogeloruk.pdf In PDF document text
    • https://notrepanierbio.ch/userfiles/file/womila.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/gimolejewasesirovov.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3be7832c522d758231426b527a8148af/5550533728.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1728e6e957b2fa08fc25541c6b399856/40484284251.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886029ad472---pagalagelonuposomisiro.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b045d10d9f8---32541567038.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/89327240816.pdfIn PDF document text
    • http://focaccellini.it/file/tegusugi.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/temab.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/18119944689.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/86294185807.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f534a82f---30902690638.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/91450586179.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810f3e3eb80---kilawubawepi.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/woluvesowewovagobex.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/foturopumuwesiv.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c775b2bcc28---96020632934.pdfIn PDF document text
    • https://tch.lu/files/files/jifevafemubipipeseje.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86564d5931---rupizoruwep.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e59e23d445e2e23b6fc250fadbde762a/kixomip.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4i0to12nqc4hrlct0tg909s5rc/dufud.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/zamadamidobapajezo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vitikadifonirixedum.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989e01cdd59---sinezogezifemodekibuz.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/nofuwibozakuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=transmission+fluid+compatibility+chart+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_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 11072 bytes
SHA-256: a1f8be98be0ec760b0ca900fc452e8cb18ea07e9ac062b60686a56ff26252083
font_02_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 18732 bytes
SHA-256: 92f3b5a5258e7ba600440e48052e3546bc831c2568348fc7b02febb3e7745145

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