Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd460ac51b2b1108…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 78e5c1de0bcdc9e0a6020384891fa1d9 SHA-1: 4f3342c59f820a84409e0e63166aa0ab76e61375 SHA-256: dd460ac51b2b110807bbd55877d9b23afdc16f4a94730df0ec0b04162753e8e0
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 0.9008

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb46229925e---66405901899.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a1f9dcf168d3a86b499ed92999b04f3a/31731099272.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kofolorozewalidij.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/24491708903.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b184466cc05---vijevutuzama.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/9213726178.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/puguletoraginabugeg.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071402420773499.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3208dee8---400161729.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/45318605228.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kosew.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/65441062323.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba795b51f---tovenemojotufob.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/bodujanugitagamefileviw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p6398pregv7j0e33536iuj93uj/63109756552.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1b4402276---zapejololibokemexatojenog.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bm4njsj3cu9956ffl05ehrm21/61218424884.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6fcd8c53a80ea5fc654224c14aa17d24/numaj.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cb54cbd6---16084188177.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b537cacd7d---23187078593.pdfIn PDF document text
    • https://yassinortho.com/userfiles/file/zekoledavifuwamu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5c529327b740d7872681411880d75dfe/11591616308.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pugoribuxi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90a40ec39---56557285327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sql+server+2008+r2+enterprise+download+64+bit+full+versionPDF link annotation
    • 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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 11800 bytes
SHA-256: 67fe0d92d87c37ef7e7235d86114a89d3d75a13b4f9e37ece879bca5d066342c
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 17892 bytes
SHA-256: 02a8419dc986741b2248d86816c1ebe9986419a18f7d091c6f3ee654da430788
font_02_sfnt_off000146d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1