Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6c06e2fdcad0e8…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 20:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8e334b2ed55b8565fb581915e70207 SHA-1: a871e489df2df69f3adf374c6f0f4f74864837c7 SHA-256: 1c6c06e2fdcad0e89b18bb6aed9244ca5b00a452511051fb8ef5aa045f373791
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://afayl.com/userfiles/file/13575214568.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b391d21e---25734900708.pdf
    • http://stroisvias.ru/userfiles/file/nogasoguwamekudokokiwe.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc0446d04---wabebobofu.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/dajerawolew.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0508f54d---zosogiwazi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6720rn2suulc5d591nkj2ue92/29826070238.pdf
    • http://messtores.ca/fck_user_files/file/23632140723.pdf
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/20131824354.pdf
    • http://sushikyototogo.com/uploads/files/45196092335.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/91ab3db30b62aaa79adadb2342af3fe0/figafirotenofowugawa.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/guzonirepu.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ad1ddba3d8552ad1f7824b7e4357d20b/fajivefenirude.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86e970b69---30579140372.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a089474a80---70682439900.pdf
    • http://canoeing.by/pics/files/80491713202.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6e8569e5---tepoxegofinuvos.pdf
    • http://xpressup.com/userfiles/file/31909830621.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b053c775bbc---lulumetavunebegov.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/1539616150.pdf
    • http://savvyais.com/userfiles/file/xiwonununakisosasefodogum.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b5932049---zibexa.pdf
    • http://bestpokeya.com/uploads/files/12770207330.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/baf1ked29rp1ihbepn6g7ceng0/25341888354.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+play+pubg+for+the+first+time
    • 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_off0000fada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
font_01_sfnt_off000112f1.bin
2d8dab9ba011f5d2ec12fbf4b86daec35de911e4693153740d536ce8a896cc37
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 11132 bytes
font_02_sfnt_off00012cc6.bin
d208b006f63b7bd2396b75530a492b82a0d5c7ec5ec4c4d18746714f32967038
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16564 bytes