Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac2d37031a2ecca…

MALICIOUS

PDF

55.8 KB Created: 2021-05-13 20:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65f619e580e23052d7cc1b3676f5b19 SHA-1: d0f71bda665090ef1adf434a88552ed29c7f15b0 SHA-256: bac2d37031a2ecca577454eb3e3defc7ffb4ef4b26b72ba202f276f4b27ef521
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'negative exponents worksheet with variables', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=negative+exponents+worksheet+with+variables
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21f626a35---rizikezulafo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ccb38d40---remogibojagiruzu.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4f86310a---roretumanakobasopimaxaja.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608123a2517c8---79633553151.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/956c431c2b993afbf29ff3ea25b5fcde/libiki.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a54247fd4---38158935116.pdf
    • http://afghansolar.com/userfiles/file/suwejuzowizalomelubela.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071d47e7042d---wogefitu.pdf
    • http://ehomeforeclosure.org/images/file/pizulidomosapofemodurudig.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bng1gs2ejafk92mus15mipdrtq/fewatavixaj.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkiuhdso7hlvihknh3kb7vbu02/12582210925.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7cjdgmng4d0i9l8ksq4t6pkr1h/40905263921.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m9ovs21msnkbl8ab0fsqsn5sbm/65663589815.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160760be32c750---samoberiwojif.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9362198a3---26144695467.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c472.bin
eae351eedfb50042743507199e0a1c0731c0935766817c4939ab46bffa55835f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 5476 bytes

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