Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d010b14725c146b…

MALICIOUS

PDF

84.9 KB Created: 2021-10-13 19:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e6154afacdcb14c31c74ab7abe18337d SHA-1: 5fec3cbfb86f6454bb84da626a50c295dc1d7127 SHA-256: 6d010b14725c146b61c8f8edfba4df22d217655fd19c4b19b8bde4c97bba7550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were extracted, the presence of numerous embedded URLs, many pointing to suspicious domains, suggests the primary goal is to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://namkhoasaigon.vn/web/images/files/93330965685.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bpa3d9cdc18rspev6v600cj22/rexewupo.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/jeneluvofej.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/71524051801.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210925130630.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71559584272.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903025451.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16161acdab4897---wivujetatep.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/zeguzewegilibesanepoku.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/tirifewexapo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/rimajiriku.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/69298754879.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/95005584586.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615bee4d8333b---lenadilozajupov.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/263245878.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/vusizefirufoxoveb.pdfIn PDF document text
    • https://datajournonepal.org/files/83589752072.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/dinozojuberonopiwirivam.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/95807468755.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zupugemapox.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/35975401862.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/70031753493.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/sakolulumisagawaw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=lidia%27s+italian+meatloaf+with+ricottaPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/bulozewarol.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152656fabd56---wibaxududelop.pdfIn PDF document text
    • 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10816 bytes
SHA-256: 107e06c0ccd82e108a6c1f35bca443686622466233494e319eba2d6dc0631cf0
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 18628 bytes
SHA-256: 909b2d04577ec52a39d1c81a69f3140677a39048004890545c2eed2473c0a7b8