Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07fc946b107cfab…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 13:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3161bd17a825dc9b0b80aa3d2d59e25c SHA-1: 683ad5102f619dfacf5b9b38d4419845f2f0cfed SHA-256: b07fc946b107cfab1db20f6175f0ce631c11d74c6d2b5dc1ac32dbee15e27f15
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier strongly indicated maliciousness, and the presence of links on potentially compromised CMS upload storage suggests an attempt to distribute or host malicious files. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=meilleur+application+bloc+note+android PDF link annotation
    • http://sladkiy-ostrov.ru/userfiles/files/73082694747.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/92548090350.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3acf0a18---julapokudowodavopedirenem.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/lukefasojekevibadepazo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/78748198680.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613521d256aed---77214127289.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/87625106119.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb41355e4f---88732888845.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/susaram.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210908210519.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/titanaxexutexewu.pdfIn PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/90639629139.pdfIn PDF document text
    • http://agavietnam.com/img/files/61451420674.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/50161502158.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/43740942207.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wukawijijedidunalezenax.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/59484146773.pdfIn PDF document text
    • http://topflexsports.com/uploads/wewedidinapejojanafej.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/91801467007.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c4c67324dbd5494a999474b6a36f3a2/pomijosezaluzozufimekin.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/2554408553.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/ganuj.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_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 10572 bytes
SHA-256: a9b5086e2acfbcc2c7c90d2660697d7d08cd5253ceaf6010ea284fe6235f47fa
font_01_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17068 bytes
SHA-256: f96a44fe185e92520f4e09d0ab46b419744ff726e62a3190679128d49fb1e052