Malicious PDF — malware analysis report

Static analysis result for SHA-256 4203f48daebeb154…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 17:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 926a64680035eaff4a552bbde6f7a2e3 SHA-1: 02656ab4cc126216dbf331d6a2f216a62d09359d SHA-256: 4203f48daebeb154c30fda8e83b2468b7f2f21816aa8674dfcebf91a9f6710e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the PDF point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://startmatbaa.com/userfiles/file/gagudufoloxu.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7de5a0e4---kikovoxunidukir.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/16634823456.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/vosotilawekamafudos.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/10228620398.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/19519921073.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/36297502826.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/62137936180.pdfIn PDF document text
    • https://ratodua.com/contents/files/fesan.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce788b5ab---6005727086.pdfIn PDF document text
    • http://kbchina.de/upload/58358993622.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/rafanabego.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/36025498942.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/juragumutidekuvalokefex.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/roxusazusugilixagij.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090503194423.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sidiniwibobomisem.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/73481676855.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/dojugod.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dirapagilipofupas.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rugufiz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/716c69bb740965c531a9312393b7ba2c/sotevidomepej.pdfIn PDF document text
    • http://domainecomps.com/documents/files/xojigani.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kpa9tgahl0chmpb5a33uv9ocv2/rokobim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fire+red+randomizerPDF 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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 10136 bytes
SHA-256: 3fdd286fa0cb5d0ebdc43fa3cab0922e858274f93c298344caa24dbb7a5c8903
font_02_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 15884 bytes
SHA-256: 91aadf20309f039c55bea9d0070791aa58e92a0307a8104d536c666d0002bf05

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