Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f75a1c4bc366e2…

MALICIOUS

PDF

67.6 KB Created: 2021-09-04 00:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 60278a7435022d1b88f12573fed4a9fb SHA-1: 5383c86d5c633917aa83d06f7a3e0de1b5d5780a SHA-256: a8f75a1c4bc366e298576eaaa70a9ae6e4425aff0102bd6bd2df687481ea7444
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://autosoftware.company/autoresponders_images/files/zubudupupiriti.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/231j3e7vm87nr31479u7ca9q61/sajev.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/suwig.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/rexanalafonidoforizavejot.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e7664314---mojoz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a180f4d8---1619221311.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/pexagerojefavilixag.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/pevegoza.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1b669d776f1a656a49596a743921152a/nefobizafenurerunositole.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/be1fa3.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/52c05c30aa04771b1f170e4118e99dc2/kupukexetejuxividamefi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607080c6aa8f6---bewubumikabul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983cffc0444---semenip.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/53822751969.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160792eef42515---24596226288.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lirejonenabesizo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/srbvrg4le42pq9bmr3d5c24qjm/54143503518.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecca1ccabf---regarizinu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/425529877bd0922a4729af34791e0444/xogowamavefekomegesudawi.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/dawibunafosojoji.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/xepiferugukagedisat.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/87888777883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+in+line+stabilization+pptPDF 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_off0000adf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF5 10436 bytes
SHA-256: a3b35664730af44cf5b9137af7145278fe82ae3ab50b3cee6068697cb9a638b9
font_01_sfnt_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 13844 bytes
SHA-256: 306365de44312c6b46837e682901148ba292e0ad34cbd2f88301fc54700c6b4c
font_02_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1