Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe77eef73943dda4…

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 18:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6be7e2c53ebaeb3194aaccc4244514c4 SHA-1: 7e38eac177fbefd23bab4334cd86f46eb879a8ce SHA-256: fe77eef73943dda45492d0bcc754d60cbab10e823f5ce83cdc0ee0e63e32b493
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7304

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 https://accounting789.com/ThImg/file/92890834118.pdf In PDF document text
    • https://laetitiabernard.fr/images/file/61351192173.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556baa35cd---xutuni.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607653273e4c7---sowerawunosizolesiz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33987efca---xupifawosajevi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d7bda722e4212a960ee8adae447aa84b/bosalipesikuwu.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/5465077984.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zarogosetepemilati.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a16918760c6---18534664532.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b63a12a2ed---masofubikoxo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/rosazulo.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kijit.pdfIn PDF document text
    • http://sivam.pl/files/file/31667585267.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/76677460548.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca1f52b1a---lakuvonovokit.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/98311624826.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nazovalivufupibabe.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e324fde943---metawenobaj.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/45874842689.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/24419012518.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c066b4a8f91495a63dc9c196558813e1/vudisalabevevogepowabu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91422575b---13238127758.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/84910e7cec07c940d822e9e453d3129d/62703270694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=relative+clauses+worksheet+exercisesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 15920 bytes
SHA-256: 13654038cf54b9a4f24dd6fb82dbda1100aceeb7b537c26ea4158313a2bcda4f