Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3dff31777cffb7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 03:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2abc412ff4e44bdb548daef2075adc55 SHA-1: e3352ea5a32c244660103a2ac3ae15707af53f32 SHA-256: 3f3dff31777cffb7eaaf93e64c1d70f92c2db497f84e4dddb497b254d19ae1cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to various domains, many of which are flagged as potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://charmingcurls.se/upload/file/5016729393.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256d1b5895---24577228293.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/94848037931.pdfIn macro / runtime command snippet
    • http://rent-lease-no1.com/userfiles/file/20210911061523.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a2a05f8b---rigolazibaluxeduvibaroru.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/87664416436.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/19426612283.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xiwarewevape.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/sedawamewupovuze.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/dolivewiniwilafe.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/kixonoperaduxixak.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mozoduxebugotadedewoteg.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/kibaradevaroxinovixo.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/65918324243.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/satato.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vilivulof.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vapad.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24b15e405---rapomasotiguxosowaze.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/85091936578.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/94417553029.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/18871109950.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/40150594987.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/memogomi.pdfIn PDF document text
    • https://refundsrefunds.cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mojoo+poker+pool+apkPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 9996 bytes
SHA-256: 681dd9cce3dd96b098f15858d6843f868b08b92128e01e0cf11c4b7dae26894e
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18012 bytes
SHA-256: 286f8025d736fa4d6020e17f2763bedf65885692859db7e73803b1e6ab32c3bd

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