Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8a9b4eacc06169…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 04:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 27f23ff111ddeb0193635407485f0507 SHA-1: adc5771f4bf3e2803aa8530a497a4f04f3616613 SHA-256: 1a8a9b4eacc06169c270f161add8f6d32aa5ad03e3f70942ac46dc08e23e9f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ecowaytechnologies.com/ckfinder/userfiles/files/90325957527.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabb45aa4b---25643170864.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/87360965179.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/433cee0ed6e9b2f656119354f85e5d50/pewobiwufipikifawivo.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/kuwuferirigapaxabasunumuv.pdfIn PDF document text
    • https://blokhol.com/upload/files/negax.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/19848837471.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/41373461292.pdfIn PDF document text
    • http://lejuriste.ru/files/file/51207416657.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/25097515506.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132e601066c3---41914287946.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/46888369129.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/16264151138.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/58901955759.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/rumofozoronejakoma.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210903160220.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/mevubexurumul.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zikekixilaku.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/47407070913.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/29634690021.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/11194118771.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b4cb6afc0bcd415a6e1dffde0f15f2cf/10242800159.pdfIn PDF document text
    • https://petikdaun.com/contents/files/5460086875.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/96640447195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+a+voice+message+on+androidPDF 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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 17356 bytes
SHA-256: 726be43253a323f99251242e29c3fb26e51a12a0bd5b5b1e5591274f781025e5
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10808 bytes
SHA-256: b646be0eca08edc7832e9ab9cf0e260293520ec99529310cc39b147bdb9505a2
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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