Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f74c50aeb145b8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 22:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10c80317390d4d516d2699e9f0605edb SHA-1: 16b7e12f1296c96b9e757c4680cd61ebdfa8c355 SHA-256: 93f74c50aeb145b8257f7dcc097bf12c7a963dd6dc787a7d65f4c5ef9b81d72b
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites, indicating a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to solicit sensitive recovery information from the user. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=android+nine+patch PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c3f5f570---tigud.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5d9c462f1707e5037856c0e877bae368/xazoja.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/36208618217.pdfIn PDF document text
    • http://asid.rw/userfiles/file/zepuzifesepife.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/janaluxeza.pdfIn PDF document text
    • https://kultmotor.hu/images/files/nodesupobu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rugowumerowogiv.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210910234958_640922138.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pududexujegilisewuxawib.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/56452006066.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/fovulaj.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/41262042085.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/1306621472.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/80047654352.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b08d7a0770bce7c53735fb1d64c83884/fabikevevetilopibodix.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/ramaravewo.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/xawirikolulakitipexiwu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/41955126804.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139986099f75---18435037817.pdfIn PDF document text
    • https://tepihtrava.rs/files/37378408494.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nafima.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/83317449910.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/75160137759.pdfIn PDF document text
    • 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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10380 bytes
SHA-256: b4eea0f0e078499329a5d5b52ae2a3939221b0979e0560fcfe90eb56e36048e2
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 18292 bytes
SHA-256: f79b46aeadcdd9a4e2fb65bd1bb2cfd5823904f47cc5dd2facc2c60709b2ddc7

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