Malicious PDF — malware analysis report

Static analysis result for SHA-256 2526c5070c414ed4…

MALICIOUS

PDF

85.0 KB Created: 2021-08-20 06:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12cfac3746dedb9f09375ff01a21e487 SHA-1: 7fa46b031bf0ed28245e3ec32c5dc96223272ee6 SHA-256: 2526c5070c414ed48a31c50e8cb404ff3857ef8336fdffe53584b461f7461af6
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzuri.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/80067377588.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd6727ace---34820473350.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/67828d8ecf62dd9a1ea1c7eeac3b1e02/60806541529.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c0123dda6c41251bc9e412fcd3ab54ac/24957303311.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf830fbf51d---85748140730.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/11200039777.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d7787f4f---liwowusazose.pdfIn PDF document text
    • http://519pf.com/userfiles/files/ponugufilisuzugapipi.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/rejuveluxusemebuwifuz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160807d9ba752a---kuboxazusuzigivima.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/20885480105.pdfIn PDF document text
    • https://flyags.com/editorResources/file///17318126643.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe227588271fc3212c5e9619495348aa/ripuletateze.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ac12e271---81546530946.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a3551178b877e5602a4ba67e78012fd0/17530122779.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210726_113130.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5265d1c12---88545135191.pdfIn PDF document text
    • http://ciskmv.com/css/file/rurotep.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/446b6bfeac078af5708a6f8a34c5414a/75338785954.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/32175048880.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kinutisumiburusisisexizos.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/30782531077.pdfIn PDF document text
    • http://seamacros.com/upload/file/mofonewolugafefet.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/34354914831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hoichoi+mod+apk+latest+version+download+2.3.36PDF 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 11540 bytes
SHA-256: 2e3a1237ea1c7d714cc447610a3a0776d3ede1da4b2f076b6f0d0ab1f25436eb
font_02_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 17024 bytes
SHA-256: 4389d9b6ec03f47eb10f084150cd50353999766136a91ca483414ee35537f6e6