Malicious PDF — malware analysis report

Static analysis result for SHA-256 967574f45aa44586…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 07:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed41467b8e623e3b63c5ef64e417a935 SHA-1: 3e1001ac3ac30564f8c3c575a20a0221ec64cc24 SHA-256: 967574f45aa445869a81f27de2a98b743436426bae2cd6e72352bf691e0e8ca8
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 CMS upload directories, indicating an attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting supports a spam or phishing campaign. No scripts were extracted, but the primary attack pattern involves directing users to external malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ttqjjqh2j999q1igmldh80j3in/gobupenulevozepavakumina.pdf In PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2610811a8---beriberisazarisi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78378c463d---siremusakale.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/wisapezogapetabidi.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac3c38e79---bunigidedavifutedizid.pdfIn PDF document text
    • https://camelcarpet.org/d/files/46424492782.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/17926768013.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/63954801621.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/rosunakal.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/wosilogetutovonuvix.pdfIn PDF document text
    • http://pi-consulting.ch/download/93007494137.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/dopadelexikuberifasumuzer.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c344f9bb---devaxilevasifefajosuve.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c0251bf7---31331407439.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/regonomozewerilab.pdfIn PDF document text
    • http://leguido.net/files/fovagonubivamisosuvagol.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a283aa23689bbf43e104b887a22b5a4c/44353909353.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/pexiwogip.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/bavujew.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/sotoxikorumubexugeguso.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c659d6d93e---41151980568.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/69223510363.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/29367772123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=staying+faithful+to+god+in+hard+timesPDF 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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 11088 bytes
SHA-256: 1a3d57f98687be807e222944bea7a0325bbb546815078517ef173aa5536c86bf
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 17212 bytes
SHA-256: 1903e26f178afc403edf10a076288721c995c4604099f7d7e0af3133df18d942
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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