Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee81ecef7989a90…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 20:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 610f99b04f0dfee214c92bf38893e3f2 SHA-1: b436fbf8ef93234128e97321a379ccea2d71e486 SHA-256: dee81ecef7989a90deabe01ca22d1dc07451557b194dbb2dbe4018bcab54b493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or SEO manipulation scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://alphanaturehk.com/userfiles/file/21030981480.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/49558032867.pdfIn PDF document text
    • https://banghenails.com/upload/file/sibixemiwikevizu.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/xusokatefipano.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a796eb04a1e---vewejipejal.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kumikumufidorixemedimope.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/43996890302.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/822d4ef0d5d9ed267c439767b32054cf/perulizotunisimesezukik.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pogofisipototivegodamenuz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125fac7906e---vasalob.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e2e6becf---wules.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rodemokerovam.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pejazujebexirutewoge.pdfIn PDF document text
    • http://fullx.net/files/kizolifom.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c292c242---31179306117.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/65117761397.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8d712be8---porovob.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/semitobavavevezek.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/butezerobi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e1102e76---zegenebaxijebupasopibuge.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/remaboturapudipuziniloju.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/f90f62c1c88171b2482ccccdb65db388.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1460e19dd7abfa0e6efe90f614cb94d/tutepuzizetezuras.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/86ieqvg511mumjgo7u9r103mm1/kadaxikunorakuviri.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb97f3aa0c7---nomubexat.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/71024281773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+meaning+of+endeavourPDF 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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 17884 bytes
SHA-256: 267f797789c8a5174a76b0edd5ebc0dda0cb3df2d064cf9043231433c582b25e
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 10560 bytes
SHA-256: c0edec92fb3bea7225313602dd8755b5eb12e8bfcafb8ebe2aefe85470520993