Malicious PDF — malware analysis report

Static analysis result for SHA-256 7817452d7f678214…

MALICIOUS

PDF

73.6 KB Created: 2021-10-03 07:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 368f98fc0f0caaae3ffed24b8b2c5098 SHA-1: dde5ec9e9733f86de7fe68ce09b29eb068d34c93 SHA-256: 7817452d7f678214f33a5666d5400be9bf79508e7c18a0277f81583183662bbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous links align with techniques used to distribute malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://catamma.ru/uplcv?utm_term=nootan+isc+physics+class+12+solutions PDF link annotation
    • http://kietminhrivet.com/upload/files/88099347994.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/2333956936.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/97962805066.pdfIn PDF document text
    • http://4bx.pl/public/file/rexezuzepetotedabikesen.pdfIn PDF document text
    • https://kimcert.org/E/file/dajevejizagel.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/exesedigax.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebb3643651---91228344177.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bfe4ebd8262c89dbf1195b24dc57dee7/37088937855.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rutoravuziwokevopa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f980b89678---35000582202.pdfIn PDF document text
    • https://tekmaker.com/upload/files/benujogifogigek.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/bobubaweji.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/23475b544baaa1539dfd42301b09cae9/76244150968.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/majisivef.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/tozewexudativunima.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/0m7j1edgfhpemvpfdios79vap2/98417866384.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/posisen.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134788541151---13649511960.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/guwefuxovefelix.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/jarafosunoxotomugojumanub.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158f2ca719d3---68906725690.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/56519237864.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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 10600 bytes
SHA-256: f79c40c6fdec43877758ef2e2bac718a209e9ec888ce586fb504d68fa10cf887
font_01_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 18700 bytes
SHA-256: 08e1d82476dd4b9924d06c23e0300da94508b46c87b7813df0b9e92340948b6f
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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