Malicious PDF — malware analysis report

Static analysis result for SHA-256 27665a49b64d654f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 12:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1de66a8a700c984552c28162a16e3da4 SHA-1: 8b472b05df1a08f0766ad6dbb6c81abf22a5ea5b SHA-256: 27665a49b64d654fcecb2a3b8b81805f9ed6b2bef0cef24dba014c53c022b8ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. This pattern is indicative of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=how+to+calculate+cost+of+production+of+finished+goods PDF link annotation
    • https://tecnibat.net/uploads/archivos/31421714659.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106231903044088.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788328a8c2b---rumigesasidegifelozara.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087537830c46---neziwexiriwogejudosexutik.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070074fccdf4---38540067344.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/8pavivgd8hl2231d8t1u7s6v5h/7924097284.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/giresedug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d59dded5---52280828555.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ppdp2b36fis8d40mecvbjbaac1/21283851623.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tbq2ptafs50nt2j51c6c73li9e/jiviniraniwomit.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/62c144c1dd49b228af2cebcb3e1991b2/27956963610.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4e4ba5a4f9988d56e0934169ee7b0877/88463986760.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/77678025234.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b1a39019---97103328769.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fuvomoseporubadevezab.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/38395023386.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5acec3da0---69767391481.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c3e01a0b068973182eab72f638ee04f5/wazofumobulojutelamukote.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f0586c2b5b7b58a16edb28dabda3b8a2/80073553046.pdfIn PDF document text
    • http://learningkey.org/userfiles/45350597698.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f641c38e54d8b9ada89b84cb4c29324e/40347641388.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qu0kcvarlbme63hbnhufp57qq1/jazonejofebigomuk.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc3414116---51405264808.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607496aae0339---xenero.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab927b391f---gumunif.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdfIn PDF document text
    • 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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 17360 bytes
SHA-256: 6faf120832a9293b4914cdb3edd267b759e909035fcd4b3b68d4fb8c0e492cf7
font_01_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 11076 bytes
SHA-256: f8fc8d7250497a574df59896ab0e6317ef0737915a8fe5a2273aa75ef922387e
font_02_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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