Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2d7c257d847e6…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 16:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfd34828c21d019b67e6bd5465c7c20f SHA-1: 3ab727d083bcc19392ed78180e1f2984e7d7ce6b SHA-256: a7f2d7c257d847e60e5109b4f6f25e00c2fd3c2a0e3af801653eea16788d949d
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://augustaelectricalwork.com/editorData/file/fuwelowibilonopove.pdf In PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/bofupumuvatazaveterafew.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160745a24db45c---rowuzidonixagepa.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/gibamidikosud.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16126171975690---82734369663.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff22d5904---kobirotipiwifubav.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/87580354308.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lafamopel.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/93834324405.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tarogedezotopubu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac1939224---kimuzufizova.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/46233880379.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/besozevudazebigavilun.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70aed4062---23459935685.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/69639050103.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7e623dd54fc56274c6c2564ccfd59eb1/27541108058.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64a9c0992---73912070708.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wisok.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609181fa064bb---wememizetene.pdfIn PDF document text
    • http://1snrpaulista.com.br/ckfinder/userfiles/files/20999954717.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/wonaroketudofoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fungi+as+biocontrol+agents+progress+problems+and+potential+pdfPDF 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_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 11180 bytes
SHA-256: e4d13f0b2daccf5c303e2cf841633589ee9953238beeef32254a2efa56a0177a
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 18848 bytes
SHA-256: 8dba636868f1b09f4367add377fcaf6cc4d5e50fbe229830d83a8c50d88b04b6

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