Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9c1e8f77fde043…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1970fb5efbce7b2dbdf9eb119294b83e SHA-1: 269a86136fae28c164065e59fddcd4b50d55f4be SHA-256: eb9c1e8f77fde0432e880a38592a122315617719bd6f2dacc8bce7afbf4d9919
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and embedded URLs further supports the idea that this PDF is designed to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8785

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://synerhu.ru/uplcv?utm_term=uscis+form+i+912+pdf+download PDF link annotation
    • http://unseenadventure.com/userfiles/file/lizoxegozu.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/farikapisuxifoburet.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/61690704291.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/59378671218.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3657426722---54788360620.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/surenokokenutunusifux.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1d8ab3f6---lulatupivolorefarivepu.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/desukiwexitu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da769ac2d3---44741672902.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc3414116---51405264808.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/gubadowosagofadubaloliv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df60dcd318---91469562835.pdfIn PDF document text
    • http://gazetavk.ru/img/file/fujun.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160886b28767c9---pewagarosudibi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218cc0ea11---direfewiramoba.pdfIn PDF document text
    • http://sieuthibds.net/images/files/95847174361.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f4db4c1f---xetuzozepavujor.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/gesinanizinirovalaje.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a278b020---32547447676.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/89236175606.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s9992et88dstj78vk6r29fssgs/karuzuropefimuf.pdfIn PDF document text
    • 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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10984 bytes
SHA-256: a1ddec9880346360af304dfef2d80218fe91bb696be413a226c006b8db819b47

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