Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d168c84ed71e23…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 14:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 361f9da15ada1780adcd8ee96d0cf8c9 SHA-1: 8f3ffa3928da4bf61ee7a80433d05e9a8cdd800f SHA-256: b7d168c84ed71e23c27db76dbdb189c884a281a1bdae79b9688ebf546f34b4ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://apnorajasthan.net/userfiles/file/zewebasitefudif.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794765a2b33---46917334056.pdfIn PDF document text
    • http://kyea.org/imageuploads/xewidomenafifekijatu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/635q2b4kd3rs9qvrck6sndkg5e/jipov.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/zorinudaluderojin.pdfIn PDF document text
    • http://learningkey.org/userfiles/89607376621.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/kn3kiiln450itobgleljn6u75j/31122317683.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/56479592913.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511be58a87---miwazavoruwun.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/livazaruwefej.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/jiwuniwinevenaviz.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/sopowafa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608faf8d787f4---62687336077.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lilukin.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/92e765446fabd9f90ba442ca35e85594/19524609697.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b34f38d3---gefufakafugobuselamifeta.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7e494b0e4---povim.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952bef8b057---jagawevu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/38816901646.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/61272749593.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/59861319278.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085933cf3131---tofetuj.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/dukanubagebumovagoliton.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=collins+vocabulary+and+grammar+for+the+toefl+test+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 20420 bytes
SHA-256: 902b307d9d886d3543fd3ea6d4f50c219a47947239253156b8a38af308d6e1df
font_02_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11604 bytes
SHA-256: a2e8d4122ceb273312241b22ff0af322cb5b0cecc868cd91b7637c9dd9e4231f
font_03_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822

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