Malicious PDF — malware analysis report

Static analysis result for SHA-256 c216639e0cc871d4…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 20:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a860be9b57bee626d5b4f373aaac055 SHA-1: bf7b72e0e500584fafb2ba0ee412789a1feb07c5 SHA-256: c216639e0cc871d42d84283f1858ec801453d2d746ad44d35615da0d7c4e6b73
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised WordPress sites and other domains, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=pitch+perfect+2+full+movie+free+download
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dd7deacc---lizetekakoponirevagug.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607379865a04f---27082378493.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cac0f30b3bed1a1e6f8a4cc9db59050c/1021635117.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/im6k8be4d1kk2beejj39n8ked1/losifukopadebisilogena.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf58492792---23328249946.pdf
    • http://kapelski.pl/userfiles/file/bofejajuvozezajegitokak.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8f472b1c---77779574219.pdf
    • http://www.gabrielamaciel.net/images/content/file/libubasoragibugalov.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/89f118b727415f43374f309eda9ddc24/40013873188.pdf
    • http://galgalesh.com/userfiles/file/rutetosaguwema.pdf
    • http://syarmarka.ru/userfiles/files/72824256169.pdf
    • https://transport-vehicules.fr/userfiles/file/66479141381.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ea1832fc---30643443515.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mjdq60jfuns4go7ti5esacm3s5/56349297058.pdf
    • http://architects-desk.com/uploadsfile/magigokulirad.pdf
    • https://stillwaiting.org/userfiles/file/36508179805.pdf
    • https://lasanisports.com/files/nadudubu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93580ce88bbff11375333f9b146c93f0/wisodoxivomepod.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/99aca13e6e71e82a35606f9ae02e681b/maronazimerukuxisa.pdf
    • http://aqbnb.com/uploadfile/file/tuzodazelevem.pdf
    • https://xo-sound.ru/userfiles/file/23006996587.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/14f6efa59b56112c42a40551734d26be/kumifa.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/9f471bec2ee7bbebc78b565ff6a0f59a/wivorezuloduxej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fe.bin
07a5fd3daad8a7cfac106ab25d8e82dd357accd23e810e5d1c8e73a50f80550f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 11088 bytes
font_01_sfnt_off000111c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 16792 bytes
font_02_sfnt_off000129d8.bin
67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16988 bytes