Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031c50252f0ac92…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 18:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0899e10340ed99801ccc818d46f229ca SHA-1: 34262931ed42db35e10ad65a0c8366e52979a7ea SHA-256: d031c50252f0ac924f76135b34eecbff2534d787bccbad0f412512902798751d
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, indicating a multi-stage distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3974

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f57342d493b---dujuvo.pdf In PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37954831844.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/dazogidufikiwibadadeka.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce8f653e2---wurododo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e44b6ddc---37680473202.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4qgl5q8q1fndfe75fimsmprg1k/49597981472.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/745bfad800b11d7baf43804f9b10359c/jutuxibemufazup.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/kidepezedubugefeposibi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/59562482824.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210706_F2B5C01C226266AE.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/81477024329.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaf3c358a2---74856512872.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/tobidek.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/bab76d17f3b0da7cc7d0f14b6c4ed4a9/wolavateloxokisige.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabe46ad00---forijomavegum.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30f60398a---tomaxerobaloni.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160db425e2d2c2---gewiji.pdfIn PDF document text
    • http://boxethai38.com/upload/file/ronowijavegopitilok.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/61456574804.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/92269297823.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/sijakomawesalise.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/nupuwafalowupibazonudit.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0609/fc79be519b5979b2bc041cce6434253c.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cd36bb028fdee8c35dcd8169531dd858/kafakobenefizojew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=periodic+table+worksheet+3+answer+keyPDF 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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 17836 bytes
SHA-256: 5595aef2b1dcf22f0f430995c2906f401f8b2370de4d5bc8b6872549ddda5234
font_02_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 11072 bytes
SHA-256: a30feaaaf37f4cadf9d20cae4aab304b5004c18c34489fdd33d78ce9f630806b