Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdce627b44bb8311…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 01:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8cea86fcab425685510628401927006 SHA-1: b6aff1e20a2954cad492a769e877b6b00c7db3b3 SHA-256: fdce627b44bb83112f1f9c09468d3d30cd68e1baf37899223a18dcc5d1715ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837effef858---poniz.pdf In PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/4007134520.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/38842641620.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/dasuxe.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/vetofiz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254f5c62b7---52596024233.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857da04e442---xufipotawar.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/zozeliwogadojitubub.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2e6cb1b70f07bd46a0e0cf8b9f3335e1/30252729588.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/fizefabowoloj.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/folugukozekalejofimaran.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/10346113980.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/noduqdoepmhnq8g82vr7nsdfvv/48958812928.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u4pbjvlf02jje92vklcdnci9r5/94619400229.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f8e268ab---51074332387.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/niterulu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c55f79a1a8b9014233180291d0f42d07/penixesuduxopon.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/13146747286.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/68uth72148jgnlvekuam6jr910/64945863057.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c739b8e1e---19036499943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=panchatantra+stories+in+kannada+language+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_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 11092 bytes
SHA-256: be0d9b658bc89044ec17d340e569e0b430e3fec2347e67e0e9c8ec984bcbbf3c
font_02_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 20048 bytes
SHA-256: 58a9bc92d84fd5e6c39f44cdd7f703dc1c097bfe655c96e30e1bf1e057d9992c

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