Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66bbd491c1380aa…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 05:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b642fd754a9c5a304e7dde66b1d5521 SHA-1: b1832993a264847c3bea30b090cdd341f6576e18 SHA-256: b66bbd491c1380aac35614ecfc24d00706a8d6974cd68931d0c7ae26b46a15c4
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ivelinabozilova.com/userfiles/file/17792370776.pdf In PDF document text
    • http://luxlustry.ru/img/upload/66559464624.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea9825f43---89322863233.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vowupidijijopum.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/mijijinulorodojivevasow.pdfIn PDF document text
    • https://mahae.hu/files/files/merajetifo.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/fijafuratupupi.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zelojatemosu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vilapu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbb852c1---wiroluwibesuwisidozejav.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17141b8e85---ripojag.pdfIn PDF document text
    • https://chp-travel.ir/data/file/befitisibapapifuviwitipeb.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/34787631728.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210719_8610E9A992B1C3E0.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7ab223e6d927119e99129011f92b05ed/58433664851.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d07a00942c223da48b6db5a8a3b7dbdb/birajuwukifeteranajidifud.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/94517687786.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/loroteganojeruwojamu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nezesijenizokubokipusog.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/49990528872.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609982c4649ba---vasubajodiruruwixusumena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=metodologi+kajian+soal+selidik+pdfPDF 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_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 17116 bytes
SHA-256: 3e74d21af5118da05fb89b7d17ac3be25889f38e5fef5d6b7c9c30836dd26bac
font_02_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 10788 bytes
SHA-256: 12e574ba26238ed2576ffd33654f93b75f0a9914ca2f6406d2a607b853c5e5b0

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