Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0579450874705b4…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 07:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f97c4db072cf43d480db73663b350197 SHA-1: 2526e1cdf6f79537a44cd1c4694ffbeafba22ebd SHA-256: b0579450874705b489b935634eb5e9b9e24ef42e9a72dcca8f76997b3eb205e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links strongly indicates a phishing or malware distribution attempt.

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://maxtarget.by/ckfinder/userfiles/files/11695278896.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b8c5ac43---wuzeridutoviwiboguze.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf1893fbf---96056368885.pdf
    • https://uniontend.com/userfiles/files/84079951784.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/db166aed512023e2b341ed61d33e9899/91669585705.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0d4e4a9cc767b6e9146ce22380f63f2c/wubakapixibonowiwuzuwez.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a4f2836850e54648a8576bd0f437dfd3/54775482624.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/nejamuxuwuxufu.pdf
    • http://ristorantebiscione.com/userfiles/files/fezepalutapo.pdf
    • https://vestol.bg/files/file/15769656771.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sg3o050gv6buhibcpg5ns29l7v/97772000563.pdf
    • http://choinka4x4.org/cms/files/file/66128472742.pdf
    • http://goodwill.as/userfiles/file/57252374382.pdf
    • http://accessprecision.com/userfiles/file/fejabavotajalerodufid.pdf
    • https://x-software.cz/data/file/wulexejofenonapalo.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae745723f3df11df7c63fdc239c798bc/23895548766.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac2eae3c3---zukuwezolefafakakujexor.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183ff8dca2---nababafotuxomamemuv.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608329a212a14---ninoko.pdf
    • http://chrislahoda.ca/userfiles/file/81453650134.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae39a93d8---42116360030.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a88f21e9---vogurefonuvo.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1a2c0ittfqj7m8m06bhfg1fs0g/64174989734.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=discouragement+in+tagalog
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f729.bin
70722553dc98bc0cebe7daa1d260e901665b74e5eea733c22737e803134e8fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 18072 bytes
font_01_sfnt_off00012609.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 16792 bytes
font_02_sfnt_off00013e20.bin
c24fd3f9ba7289b5276bcffa9719d196506c973647dc58368dc3c32463fbd236
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 10676 bytes