Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90aa80eb4599dd9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 16:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f01c207382a2adb446028999079ea8a SHA-1: 2d99556e4f1361de1b8c6712ecf8f376ffcc5ce0 SHA-256: a90aa80eb4599dd9a380554cc296b8b5b6fc94c0d07b894db1e80ad75b430577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://vinhthuan.vn/upload/files/xepejafuritewagirelagu.pdf In PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kamopafaxaseju.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a1c42f6ec429d68f6f53beb5d71ad2e5/48876084146.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e481255acc---kixovakosota.pdfIn PDF document text
    • http://dentali.cz/files/files/20931811842.pdfIn PDF document text
    • https://dacola.com/upload/files/10396479036.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/533220928.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jexurerokum.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/67985290719.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/94216525019.pdfIn PDF document text
    • http://iphysiology.ru/upload/ropanadugopamuga.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/zusezigodukujisadaxufujoj.pdfIn PDF document text
    • https://henuopack.com/d/files/55180220161.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109090851173968137dvu3.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/31770662216.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/setot.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/26107914326.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/86406816332.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zaximun.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/wibefapifupiwedixiwo.pdfIn PDF document text
    • https://uudanbury.life/files/file/88934596717.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/99844005173.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141598fe56eb---vutojifuvurew.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/37463988017.pdfIn PDF document text
    • http://svx.su/ffile/file/siwatasebipadajagiluli.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/63218572038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=workouts+in+intermediate+microeconomics+9th+edition+pdf+freePDF 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_off0000bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 17068 bytes
SHA-256: 7dc4aa2784831599c7ff960023126db7a65f0cfdfe5f189cdddc1a6da4c1d83d
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 11192 bytes
SHA-256: 8d617046455262123361065e6531326725e45491b4e26af2202b2de10d63f56f

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