Malicious PDF — malware analysis report

Static analysis result for SHA-256 30459a83c72f42c3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 09:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ce6a286fdeb05c2bd724e6a61bc722 SHA-1: 1ca7b25529a56832c140b964bd0c3d33de7eda70 SHA-256: 30459a83c72f42c37906b616a3bf0f6254a7f894be08a52d5f05225bd92cae53
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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 http://taxicityplus.ru/userfiles/file/gexapedozebumejuguvutefo.pdf
    • https://midasspa.com/ckfinder/userfiles/files/suwowonajonike.pdf
    • http://optikametuje.cz/userfiles/file/87222820388.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8d78bba3ee2e6e01b9324ae20d689bb2/digudanawafu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cc0d87b4---73851678602.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46990819b---dupumiwa.pdf
    • http://autowagon.it/userfiles/files/9462879644.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/nupijojagev.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gjigikasbn9aiu4oogso7d9pl6/85644457113.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97c22c7b---2975040982.pdf
    • http://ooexperience.be/assets/Image//files/2929072847.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/697fe993ce94ef085e0564bc607e7f1f/fodafitejazesugodonopef.pdf
    • http://studiofranzoni.eu/userfiles/files/fubuxemetojov.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160948618c2212---5145948825.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a140b28069a58d50fb0a2cd1bc2c9169/24154807581.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/97647918358.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/4458238757.pdf
    • https://rhuyscampingcar.fr/images/files/271979736.pdf
    • http://sammyurias.com/userfiles/files/26295699115.pdf
    • https://ludifrance.fr/userfiles/file/2467831378.pdf
    • http://wtmongolia.com/materials/file/vefesunugepurusuvu.pdf
    • http://haciogullari.com/depo/sayfaresim/file/24729553301.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/93103053951.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ergobaby+360+4+position+manual
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc26.bin
37088f5b390fce6a20a846e174c3872cc58820ac17fd121089662fc8c7352ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 11340 bytes
font_01_sfnt_off0000e6a3.bin
0a53b3f80a5c9d3cc8b8fd4058847556325cc8af114ad432ba49e06fe2680f73
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 17972 bytes