Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed35efa0b08cce34…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 17:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdcb81e194a14afad5e3dc44e8d83af3 SHA-1: 21bc7e5dfe2d5ab28b094bb2f587923961161218 SHA-256: ed35efa0b08cce340a5eb6d589d23a7a4701f6b854651b7d97ec198e0e52e6f8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6859

Heuristics 4

  • 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
  • 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://laborke.ru/uplcv?utm_term=pharmacotherapy+a+pathophysiologic+approach+10th+pdf PDF link annotation
    • http://szakkepzosiklos.hu/upload/file/tisumigubadexalovakan.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/sinevinev.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/36793778638.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6a3f3cbd---80565388296.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef46a27ed9---33196272731.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a519656a9---jopuxijavaxenubogewuwu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a14a73383---popasuzekijawetana.pdfIn PDF document text
    • http://zerosquareonline.com/file/mefufakemaxaxomonoxozok.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2559432917---93636420151.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/komomureguxatudejavixo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c5pp8agt76ea67h8e9ld3rf6a0/37758076624.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4fe7e04b7c9727205b459aebb1405edb/novivupokala.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rjrnqtrk4slv4a4cktd45s0dn6/zazotanidunepime.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/79343707026.pdfIn PDF document text
    • https://kawanmto.net/contents/files/24098725251.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e84c321aa3---livivewojopoxevepakaz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfaf4fbe3---jalipunimixomuruf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b231c2e8887---38473634491.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/wuxulawatimikajal.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c30888dd7c41b3f680f50170b6f7ae06/1048103937.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/83451225551.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/semojedidiwagefegigu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80A 16700 bytes
SHA-256: bae7eb06b364c8b5e5e3606d8d2397b329b45badef5ed68666023f63a2494f28
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11252 bytes
SHA-256: 9fd5690c211d4e0ea3703f9746de05be7b7c72d659687ce6d68bf9b6f6869b2b

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