Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dcbd42be0103cd…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 09:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba2b867194a15379637f00ef52f67be4 SHA-1: 2515398d9dc2b4f008059d88f21b923c6ff6e30d SHA-256: 25dcbd42be0103cdfe484a11971702eaf97de0817d780043eaa9db2cdca4722c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign attempting to redirect users to malicious content hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f884ad03---74169331083.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dec3413b---sunasopimisevuxonipuxa.pdfIn PDF document text
    • https://auto826.com/uploads/files/posate.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611448a478fe9---lopawizugipoviwota.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c16561cd3---rofikos.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2586be0a56---63188705161.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3918441f35a1e19a916f5b957b52a8e8/16472346588.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/9303228304.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/basuzofurab.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/60963657230.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dkngq6q1f05cs8hua4ftq8k9d1/vibixonikazo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/wudon.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/nubokixapek.pdfIn PDF document text
    • http://rotang.net/userfiles/file/3616876283.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/vewakigodogisidofomujizu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/gupugegitukojiwabore.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ab140bab09c---levirixaxuvinawavaxatif.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fa73585e2b6cc36e9f93f82603afcb46/27049603996.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/pesuxezonuwuxato.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610027cb68768---61392506927.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/pojejiremiguxaxadotakub.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/xurawobufa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab23a2feb9---lefadexekexazi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d49ed8b2eef---11408314277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=divisibility+worksheets+for+grade+5+with+answersPDF 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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 15952 bytes
SHA-256: 2c8ad39f79146a90799fc31ec284ab6f2893fa7149ec3918dd429cb82bce29ae
font_01_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 11268 bytes
SHA-256: daecdd6f2d872a6f0c7b41c1a8d66dbd5cf472c57a701cf311f135b22ead6d3f
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.