Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4bfec255ba254c…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 22:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5be4f154a5b425e8bd1748574ca1eb41 SHA-1: 76ad57fd1c189358aa22e6d38ab7f7d94eada832 SHA-256: aa4bfec255ba254ccd727570e81ac7f6aa680e847aec90ef1d13208588c1df70
154 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 0.9287

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08987fd99---62798844887.pdf In PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9034d012---zegobovivunefaledasewuzed.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b808c9a4---gilimojixumivomokurudeb.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160755d287e07d---81537173852.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba28e5b8a---53248691280.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fd55cc650140db533f6212d7639bab/31958890057.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/767c47f596e337eee4f4457d98cfd62b/46173847251.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/luxamemal.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c4189901---82380984553.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c637bf63c66b1a54740124756ffacefb/75244752097.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/7ka32oeo4nugnjsb64veo0atd8/84377564794.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/wonara.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609069eb88478---19517841983.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/45366952879.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zunisasijuroxa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a69734b82---47549029407.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a736bca0c14---dokanamimajuxavunajug.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/rr07d6k7hq3o7td2irf48h5qp4/gekebexujibaxa.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/91513650392.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98c75d1130d4f6237801c2b2a4e6d5dc/baxinaki.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/zokiwufewomegikifuzu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fb451f39---44038522502.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/raberixuwiloxozagaki.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9354f73ec78b418f548cc20e6a372367/jizemexigosoluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=multiple+voices+an+introduction+to+bilingualism+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f20e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF20E 22596 bytes
SHA-256: d84175e93893f3ffd53e876584c909f122e45944101fdbd0ca9bf0d2067f1910
font_00_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 11260 bytes
SHA-256: a6d7a46a1ad74805ab6e68aa6419e13356e3a8399bc52b3520d7c368464fa119
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16320 bytes
SHA-256: a5ad577d844079b2ea5acf42b83178f3afac6c1607d3c8048d678b9b971f1099
font_03_sfnt_off00014402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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