Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ace8958314cc264…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 12:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 280cb5c90c5feb0785720acc2e490b4e SHA-1: 6b9a124a5ffbd29c34e80503c4a33f15901ff58c SHA-256: 1ace8958314cc2647ffbbd98e7c8bee3b395a9aef8371195564cb3feb44036bb
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the presence of multiple links on disposable hosting suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://yilip.net/userData/board/file/vexutobesuginesabulemap.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161274ccb2b178---nipis.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135c4a82c11---fifasuxima.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/vujobolexijupapitewedo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b21fc8cb1---3769627525.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f8613aa6---botowebifesuxuje.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71580cad1---vojulaweki.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/sofar.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dcf7b86172a739bd4eebac1d377f16c4/12093183247.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a50aebff0c702161b90fec408660f526/botijip.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/61b26dd2e8a712e0342cc702b2d47b6c/moladorepiviku.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e8d5d666c530dc70dbfa5688c10e35fd/99644973045.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/supokofixebatub.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/67905122673.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/2334218908.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160815e409e9e3---20443006745.pdfIn PDF document text
    • https://stauber.lt/images/files/genevokizo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/lopolamidawurif.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ad923f8b91795676106dfc5caaecf0ca/misiwesiderukogolidanuve.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/medadegolatevixuxafum.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cb92ffdc96fc2a0763cb733226875869/lewenoxizuragara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=corbin+russwin+ml2000+parts+manualPDF 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_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10880 bytes
SHA-256: 45a3c1328891c53857a5a1529055af740d24251a545826451f9ce87c9810ab69
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 17664 bytes
SHA-256: e94ba5542f43009ea048de5fbf5d45f40a444f9d6f2a195b712ed975ab560c48
font_02_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1