Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e53744c14587bf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 18:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82baa5387664dc8b1529a72806605e2d SHA-1: 556a3de61b1dba0e5fcf8c97d9a8d02b73043de5 SHA-256: 82e53744c14587bfd9983d27e77afa6b1c843116fdd3f8677efde7c1f51a6647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5695

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drumlockingclamp.com/FCK_Editor_Images/files/xejafoganotabigu.pdf In PDF document text
    • https://somogyplusz.hu/files/letukaxebedajudikogobi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143316806e4f---jakubepuvumero.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/burosuneligaditofokawokij.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/fibudozawubuxoruwelexukap.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/biteneb.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/90458927328.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/93797825645.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pinodexatupimifiluwibegoz.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tuloxasuniserepepotepid.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/wokanubali.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kemokemowenerala.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69595290fafcdb7e509e2142185580ae/nekewanejebafixij.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/manaxumijenafoxipomi.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jimew.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/23879621484.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60955366069.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zameravar.pdfIn PDF document text
    • http://szcftz.com/upload/mesetipajukilige.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7979b47d487f65eebff7f843032f98a8/1974184371.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf149fad3---16823699515.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/35952582708.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/livokawerezusijiku.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/ritin.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/81637773335.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rejewijugetijenirevagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=th9+loot+armyPDF 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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 17304 bytes
SHA-256: c3865e10e254aa72d4113202f08189637a956223fcb61cceee42b2d6ed5c3756
font_01_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 10124 bytes
SHA-256: 90360137321b2b6af33093bf1719ad6f3059dd11200853f7d8053db3586adfa1
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1