Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bb18287b459fc1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f3291d55932b3e5f1f27e4d95b036a4 SHA-1: fcac4a947ac01b511b3a031161c0d0911363bef8 SHA-256: e3bb18287b459fc1f09847e1781b940ab203a03e947e59bc8fcfa27c58bf598a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic indicates the document's primary purpose is to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bsinteriordesigner.com/userfiles/files/ragafofibirurifelixub.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/93452616494.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sevasir.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/75190910955.pdfIn PDF document text
    • https://zzwgjx.com/d/files/nifagew.pdfIn PDF document text
    • http://etnorom.hu/pictures/xejazit.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/kunumiwuvijalufaziv.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/noxasugolevebetotawefu.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/80978685030.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b0f3465a4047f16d4c97d9f35a3c0a4a/wojixatunom.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gegonokim.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8da4f2b4---wutuduludokafufokonufetuj.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/witezulowaze.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/45802690521.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140914066b65---30365583925.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/89443398996.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/81d287d2aaf03b60dd6b3298b2df7532/15890635355.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/nijipezixigamanunidijis.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/xebejof.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nosilepefal.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/ramakefivazojagajet.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/jeropilo.pdfIn macro / runtime command snippet
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca320119c178590a14bfe7553f3c62eb/tukuzipoxixumilogazojavu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/63666003467.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4kmpv4akg7uei0jvvv7c75qhme/31420509262.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/wikefotox.pdfIn PDF document text
    • http://bakineshr.az/ckfIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anatomy+3d+atlas+mod+apk+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/30fc6f804b382778f095c812ea18745d/17226392226.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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10676 bytes
SHA-256: 2a78c81b2769b5e98e9a65ad68dbf0b555a6e0dae8c8b93e7bee41572472e450
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 17604 bytes
SHA-256: 516c88af568d46f199b2dd857ca3c4472e173ae87f209ac848f595b6c3c00fe9
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1