Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa3a949f8a23097…

MALICIOUS

PDF

89.8 KB Created: 2021-06-19 11:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cffee7739f05733aed7b495643bee07 SHA-1: 16faf2302e796fd22a20d240cf70132e85e0d74f SHA-256: 9aa3a949f8a2309764368193cb557df97b1bbf87fd74d212306c0bd0a949cff5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests SEO manipulation for malicious purposes. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2552643fedf5deb662efa59dc730785b/ronulagitutigukoxazorax.pdf
    • http://marinapogon.pl/upload/file/jorotodolob.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3269d7c57---56978260847.pdf
    • http://growlink.biz/userfiles/file/xirena.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072affee6b11---51797917831.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eccf220ebf---jajukasiwutikavib.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755004a4142---59592727485.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608da75b49bd9---19177426656.pdf
    • http://abovomedia.hu/_user/file/67008535786.pdf
    • http://guoyangmoju.com/userfiles/files/selejoj.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/eijgplhhlcg9bqfs3f5o5gql89/20288785128.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829270d5eee---76901281075.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5755a55utusb9oaufuljukfu02/tolobemisu.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d04fa57bfa6d7fb65627630a303f25c1/93597589094.pdf
    • https://alarouba.com/ckfinder/userfiles/files/78666129411.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/92ef9e075aad0f177b238e920df85dab/semabikoriwarebitiwobik.pdf
    • https://guruamardaspublicschool.com/userfiles/files/lovijenizomumubarolute.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea24a3847---zipelaviramil.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/40h635hfqh41bort80m5707j7p/14104629517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=new+skyblock+server
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b1.bin
33b9b562f03b75490c4c9aa59d9709c0071a00c20eeaa7b3f0e6369c9d526ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 5008 bytes
font_01_sfnt_off000116f7.bin
c281b5b9093b01654786794361fa3e35e6a3f67ebd73e4f17900d6b84c5f0de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 14604 bytes
font_02_sfnt_off000143fd.bin
24d347181643451af79f8ff316c63dbbfcfca44adeb9fbb892fc820d4b8d4c52
pdf-font-stream PDF embedded font (sfnt) at offset 0x143FD 16364 bytes