Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aba61ed53c63f28…

MALICIOUS

PDF

102.0 KB Created: 2021-07-28 05:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a2628b67051d06a02e9688c72e96286 SHA-1: 654671100e420d7185da714e2602885a3ad018b1 SHA-256: 6aba61ed53c63f285e0fbbc6bf3cc94b9d5b539eec87f535759582ae27b7a1df
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160774c4a0865c---fesorozevazavazesoza.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vifa2hie75ql1ot93ij7unppe5/9208591819.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/56317859173.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/00qcodumgj25o2gdvs9a27v675/jozaxawuduwu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608734959ead8---37910522680.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210605041812.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061522450573499.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/gewoxudixode.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071e514751c6---pitumefe.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/96465044881.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/matimiwawaf.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/tedakaluvorusi.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/gugobajaz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa247e0e0f---woviguxubalubusesa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160883d6ad2a71---dorupapakojaw.pdfIn PDF document text
    • https://stvorki.ru/files/file/redazomiruwudaxotix.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/55319431868.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74cf58976---rofevof.pdfIn PDF document text
    • https://tavio.ru/files/file/59812913841.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/20691f424890f78573a4194d3cf8a601/didivusu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/58432529658.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/94c2b164e58b82ab610dc6439ad9b8ed/pivezanoxid.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/efc8d982734cd3c42e6ce97f00e381dc/vododopisi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a36bc6381b86e1f15c73ab55e3804933/sexeboxuvalakorep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=conversie+din+centimetri+in+inchiPDF 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_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14170 10524 bytes
SHA-256: cf0df3428c60ed097f94ccb9a85d5ba48b05261309ae6298e9f9c1f77a4d7b0d
font_02_sfnt_off00015943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15943 18888 bytes
SHA-256: 23ec25bd9b1a675b2b333a8c6aa274c39314ca8fe53280282524b9d1813be4e1