Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11cd8adfddae2fd…

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 01:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f36408ba7719c78b402184d0836f86d7 SHA-1: b245cf103831af767b3b01efdf264cc47b450d33 SHA-256: d11cd8adfddae2fdac0736517234160579e6e34218e7cbc86261fd9197bfb003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification as malicious further supports this. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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
  • 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://ketchas.ru/uplcv?utm_term=cambridge+english+fun+for+flyers+student%27s+book+pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd70e22f5b---17998431158.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6468d769---62663871916.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1b0752ef---31019409372.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086400f7d14e---80529355403.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/33vk39a8c4ekf7riududdi04ti/9606133150.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a0072689---49603477267.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ef57468---xozosaxisiwinebepo.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/15127272106.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e40ac730---fafaridemo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db7cce503---91913337057.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/nolekigupuja.pdf
    • http://peknanevesta.sk/media/file/jekanolelojexuxij.pdf
    • http://statsale.com/data/upload/ck/files/zizomanigokipidofobo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612be99598200---selow.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5ff677ce7c---ledugiwujerovitaro.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab88c0a41---kemumoxekole.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b0e49e376437313bb8b4b9949387e3d/memisu.pdf
    • http://yongqingtech.com/d/files/92025405979.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dobasazibil.pdf
    • http://thechitay.com/uploads/userfiles/file/mimonibefozezeridata.pdf
    • https://pharmnet.cz/ckfiles/files/files/metoxejizitajewekibut.pdf
    • http://cee1968.com/ckfinder/userfiles/files/dirov.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9d750bc11---kutuxeludu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14d0df02a---refujusizokak.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/16237511833.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tlob22uoshte8s602s1rkl551l/pibidinujufevarinilixazeg.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nag90jbbmj51u6dgf7fspm85k3/jenikim.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 16792 bytes
font_01_sfnt_off0000e497.bin
df0664e6bb5e8e96749964e0ea1a4d791cccab2b611ffc437028e379260b032e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 22252 bytes
font_02_sfnt_off00011cd0.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 1680 bytes
font_03_sfnt_off000124c7.bin
2ca6196fa0e4c0eabacf9e5b7f8a4a0ea24a2f1f383fa9be118d54ae364a8ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 16276 bytes
font_04_sfnt_off00013af2.bin
f8c6ecc9c49eb0ce9307b2f0fd054e64999ab65baa5a3ae3b95673f8428a88ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 11456 bytes

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