Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e10d157d7eae1f…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 22:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 034957cd5fba17a130121b44db68e987 SHA-1: 6eed8a3b9453d43f3a205142c2a5b81037d72193 SHA-256: 92e10d157d7eae1f61bd7f28b3253246484eab55cd647a2f57838c1c707e7ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of multiple compromised links indicates a strong intent to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96fa57282---15306487579.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab09cf03fe---pukeruwovunem.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a03309062ae---pevuwixinogo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/84104932784.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0812b05b74---7050837808.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/zasosumupobigexedipa.pdfIn PDF document text
    • http://airsoft1.ro/files/file/69611158208.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/sezejakoj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8478718ff---13674679999.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f219202---8776928118.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/24450088782.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e59bc74a---razek.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96cc3723d---26184574678.pdfIn PDF document text
    • http://imbirimbir.ru/files/motojorutipeja.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zojarosokil.pdfIn PDF document text
    • https://fishboat.hr/files/lonolupozi.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/97132804012.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/gajadunexeluwepakirexuxa.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f5ed0c03---leketifevedafedofokofef.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8auij9729unn0bpdcb9gqeqglj/somavodi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/43179385234.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c9547fd60---zawexa.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/vuxididajonusu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2e34782c1c8678cdb5e8f2a33297411e/71796101754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=indian+names+for+twins+boyPDF 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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16776 bytes
SHA-256: 7840273f2f149467b3acd589c59eac05712346bbd52a400073ec997d79d2936d
font_01_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 10760 bytes
SHA-256: 7083756f8449ef3a94ed6498c224f7a24ec2ef2c284fbd0e4db878cec291c345
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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