Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ffbbb2e22d1e27…

MALICIOUS

PDF

86.5 KB Created: 2021-07-04 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c2b92a5c97a11e0cb1df8ab0c58734d SHA-1: a34427b7f74edbcacd54c0a03c80ddda052d89a1 SHA-256: e2ffbbb2e22d1e2704b08255790db4062054bd098fdefb833d5608d8762eb154
116 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URIs pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the heuristics identify it as a link farm potentially used for SEO manipulation or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to malicious or compromised sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 https://drafthe.ru/uplcv?utm_term=integral+performance+physio PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab911a4bfdb---gelejerogomejak.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/tavozodupafu.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/8054679783.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10be09a3f6327dff4da6c90322e0d154/nozaxusimipelejiwofitik.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fefoturarusimilanabubu.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mebuzimufebiwumupatelapiz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098841d14598---86937474221.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/36344347185.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de4b5e6ce197427e78ef74cd2a362bbd/bojefasazijaxo.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/29884482744.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa8365ce8---xelav.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076905b0a7e8---33930765446.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcaf19243d---54977537093.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lolokugudibefoximisa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a555af8d360---33789797385.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n62dsnfbkr60afq5evr9jqnmm1/gapetatikas.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5daeaa4a50---1677435388.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a40374c4ebb---3910919491.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/duzupu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2a357d27---20044740872.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609408c93444c---72192586985.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/ziwilininobaxorojajovotap.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02e40e332---32162824121.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10992 bytes
SHA-256: 1c0f9d24b90948829406eeca23606dfc9b092d56fca0fdaada4ceb9ff2813195
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 17364 bytes
SHA-256: 77f4da28b5910f5d592efba1525e77be414fd72a18b39743dbe8b1aa42bdb422
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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