Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed02e0f1450915a…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 16:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28e3b31d42f9631860aba7187b28a99e SHA-1: 71fbc331393792f6b2f944a87d59d6015df2fb04 SHA-256: 0ed02e0f1450915a535af3142a0ac0c5e5c80d2c2ff5979764fcfa9a9ed58f05
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware through these compromised sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://orchid-daikanyama.com/userfiles/file/3483792796.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jkv445djp79qh53knp2hmdacfp/28734388162.pdf
    • http://wingmanresearch.com/userfiles/files/woxera.pdf
    • http://extracam.es/app/webroot/arxius/file/95110050325.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/50997062301.pdf
    • http://daikinhbac.com/upload/files/derovogumugavepeligozitu.pdf
    • http://svx.su/ffile/file/91603886853.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/0fd08830cccdef824ea53969166cbde4/53137001610.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/45406564322.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/24912230676.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i36e3g479cs95v9abcgmkbukb7/jukitafagakulorakitolapi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/an7gh284u7rldqc7abqbpg5rg4/guvip.pdf
    • http://aliceinformaticasrl.com/user/pages/delejikobuxiganasube.pdf
    • http://allycatering.com/userfiles/nowadumenav.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lbtrp2kfqbl6hrfpee2s74tec8/lopalaburowenopit.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1ad7arahn0v8j0u8f5eva2v5n/vinutop.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/93044239437.pdf
    • http://ecohouse-lab.de/userfiles/file/48919213842.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/369563b04d1b397e287edf6d40436705/10421414482.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e568f1e843d2383462f14f8dffd1d1b6/xulezopuzusavavowulujojux.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6910821667.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/161f64d15315b302433af8aa9d736546/4985837788.pdf
    • http://epoxidice.ro/mm/file/62825218124.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2ed55203---botemizajepivogaganitil.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mrrumngj9fvlo3rpnotk1sr2v8/53812540942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=letter+w+in+french
    • 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_off0000eb30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16792 bytes
font_01_sfnt_off00010342.bin
22b69b18e171d5604fe2ae02339b9e583a984388e4a0c1b8ae47ce336cabdb28
pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 17244 bytes
font_02_sfnt_off00013017.bin
b0042bc89cd3d3cf0a9310da31595f0fd57c9f5dfb8b347f8c9d51e0b4dda278
pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 9980 bytes