Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb81247158a24ca…

MALICIOUS

PDF

83.2 KB Created: 2021-06-29 12:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a68bdf44df03ad0d591b34a8215a67ab SHA-1: 988bd7198db0b1a0663d22e5d325ddbcacc46853 SHA-256: cdb81247158a24cac0041d3c420dd92ec6c16de28a02d178026dd0822ac5a103
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

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://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083ac5d255---wupenaxititosarabinafuwa.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc4a515389---bulopodanofos.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486cc26b8c---votavururapawawitewifibe.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a486a64f---gemisonojofolisivanoz.pdf
    • http://barudan.hk/UploadFile/file/20210614090719306.pdf
    • http://pho32shabu.com/uploads/files/21231193091.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/57935383916.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/64ijj7a6u4mejkf8uvbnd0hlme/bevagopebumuwipu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/894h22thufqbniuukc34ur80gi/jefof.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c58cdf6b2b7---44298969081.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c71e610dd9---bazuvevivezupaja.pdf
    • http://rheinmotel.com/userfiles/file/46390345439.pdf
    • http://tremonttemplemacon.com/clients/862779/File/80775025489.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2de9ae45---xakuwerewikem.pdf
    • http://alrabbancapital.com/file/files/30773709501.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/mepapixivekeje.pdf
    • http://montaze.org/democms/userfiles/file/52421011338.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083050b4bffa---suregutatajilevujexi.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tmetk7d972j431em2ch91n8ge0/kovusoxerududokiv.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/079bf5bbd58c3ad3ec3beb9076ea43fd/lewofasut.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6eb816b30a76837f254849342e6ec641/vewukokapojinisuxilorew.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f0okaa5kcd4852jnmom2t6ugj/33336590177.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef59454dea---jujewobor.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b209c4540---91588394156.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rj5nsffp7fsq9g62qsok9ese41/61764112735.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e454d032a3b5c59491f662432a061ea7/24119608176.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=keeping+hyperlinks+when+converting+word+to+pdf+mac
    • 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_off0000e0f9.bin
6ddf506c2cc10fc0712823975a7cd9db2ac0282c26d0748ffcb5203aec09353a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 11416 bytes
font_01_sfnt_off0000fb98.bin
6eca6bb972f6f8d0c43e3b9f94dec28e8469b5397b40bee37779aaa85fdc4f49
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16636 bytes
font_02_sfnt_off00012713.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 16792 bytes