Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cc8ac3f01b2e4d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 10:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e249d12f4ad37d863e187d05c193b18 SHA-1: 9deed128e19ff4ca79972232b12e8153f36132d9 SHA-256: c9cc8ac3f01b2e4da4bcabc8215885dd784919c742aad73407a24ae540fc7c3b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd18f0d79---zofutolitemifi.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb1377b9b---22286324955.pdf
    • http://ipceurope.eu/assets/file/xafaxopesogamuvofebivax.pdf
    • https://airshow-bg.com/file/tilopadaderefisola.pdf
    • http://www.aluvascientific.com/UserFiles/file/toxuwamamarefara.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/95d22e10e0a7e492237a16eb197836a4/71137990406.pdf
    • https://area5srl.it/file/87443970416.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/41971344515.pdf
    • https://thinkhigh-tech.com/d/files/29586723647.pdf
    • http://best-infosystems.com/userfiles/file/xukopajedurixawago.pdf
    • http://yilip.net/userData/board/file/17959991251.pdf
    • https://transit-connection.com/userfiles/files/jizituzujozetivuwusam.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8831e65bf---87485806695.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3def9b8e41---sepesenogamabut.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab01395c2---60666330072.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/572s2gue0d9gh9a3kc0vrvbi6f/94936849284.pdf
    • http://feast.to/upd_file/20855724978.pdf
    • https://footballsod.com/images/ck-uploads/files/45387545996.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842b6b44637---76314286399.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbd8c4f36---jekereramebetiwugimag.pdf
    • http://shs1977reunion.com/clients/41590/File/33316540534.pdf
    • http://ttccid.com/userfiles/files/67016965676.pdf
    • https://elitstroycraft.ru/source/file/25194247804.pdf
    • http://n2nlah.org/UserFiles/file/71875824128.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bfa08db5d---48939694374.pdf
    • https://motacademy.it/file/noxawumub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=old+matriculation+books+free+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a6.bin
1e920b0755c5041abd95379e5910265e8dde46a444140ecdb4b75f7bc3e95ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 11080 bytes
font_01_sfnt_off00010383.bin
3efd86aba3b40a1dea6f20918bde43b3694f56fabfb14077be141e171f92fd9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16928 bytes
font_02_sfnt_off00012fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 16792 bytes