Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d27c14221985be…

MALICIOUS

PDF

97.8 KB Created: 2021-07-26 05:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e05aa643c58b8ef61226790a1f1f3ee6 SHA-1: 37354db4a70029b621c302ad16d401289f006a16 SHA-256: a6d27c14221985bee5d686d6f071f3934a89735d58ca7816a637f0595ac02b8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple distinct hosts and the use of disposable hosting further support its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/770fb19bd294e42b1d2540c41ffa8350/nufivalidotavuf.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/j53euak849u1qrbv52sdaa4l1m/36712821364.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bs22l7499mqo80uuh5c1db850p/63631627473.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089243aed8a0---xuwamalunuzixogogozaresep.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/88735099222.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222ef29764---zowazizetokodi.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/munolapewakolodojalej.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/sojepi.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/36824527610.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34017828cb---8747412033.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/57639017125.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d0c85037---jepokefuvux.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/werevizaxaruso.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gidapasemajavotozovunedi.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cef01366812b4f1fcc48ea52ce1c0e28/23660210246.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210626045532.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/13840357234.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09f24a7c4---92092705558.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17c3e5d9a---kaxasepabig.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/23523620943.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd1021d213---92819878095.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tu6bcive3dpph5d3l2ovvcv9v2/podexigopavanax.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/27264d256d91ff7583037dfc46afc1db/rapedivosawosidadorufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=list+of+asme+b30+standardsPDF 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_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 17860 bytes
SHA-256: 6cb116c5d45bb514c0c7ce670fcca0101e0a99c0741516ec16b013a885593d5c
font_01_sfnt_off000148b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CC 10860 bytes
SHA-256: b49f3c34b118ad2f6b516df49f22cd7c139dbe44715af9c2fb9d30ade88d65f4

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