Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcb1817173a3a83…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 00:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01af2afe829cd1f98b3b4dcdbb411955 SHA-1: 3457a815f1834d95c3a5dd74816adb21d5763d71 SHA-256: cbcb1817173a3a833e875e4e036e2aff7151793eb673a45f493c90e7fc913bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/10483039908.pdf In PDF document text
    • https://dukra.sk/editor_uploads/files/situzipaliletunusepo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139148925ee2---59728403981.pdfIn PDF document text
    • http://live-net.it/file/lumomonojib.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/34463067519.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/kuvop.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7d8b6952---37795530241.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/19914227674.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/sidofi.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/wosuza.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913030928396566.pdfIn PDF document text
    • https://x-software.cz/data/file/kamotasuku.pdfIn PDF document text
    • http://dgkno.cn/upload/givapugaxetosorab.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/81770020218.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/78410015447.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lokusigudetiwup.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/dakijiwizenemamiwaxa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jous9hcsmcg4tk0bd6ioh5o9de/duxeji.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/36140320974.pdfIn PDF document text
    • http://afslab.asia/upload/files/74232923475.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/15976197233.pdfIn PDF document text
    • https://oferta.lt/i/File/56970162727.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2c9a4825---sujekilud.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hmn0k9hml9046kfkh8mjqa4gs2/bubako.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/supelizaloba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+video+callPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16968 bytes
SHA-256: 7e87144524dcd9e983c1df7e6e465e0f9dd1e0a716f14e16f130d4c2c4ce044c
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 10068 bytes
SHA-256: 79a8929a846ff6b4b69bf51cb094658bb3b3b93429ff2a131f3386d06bcbfc1d

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