Malicious PDF — malware analysis report

Static analysis result for SHA-256 92417a5828eb23ea…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 17:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 829dffe779eafb755ee82219922cf6dd SHA-1: 1bd889d59f3d5ff5f1606a90ec34fd044f884320 SHA-256: 92417a5828eb23eaadfe43ea2b7165aafe9b6e1f4f7b631b6e2d1b86bce2a472
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as link farms or potentially compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were extracted, the structure and URL distribution suggest this document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ristoranteyuri2.com/userfiles/file/94601203069.pdf In PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/76830202909.pdfIn PDF document text
    • https://tavio.ru/files/file/39215237524.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/47339888139.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc1d802801---gisidabawerusafoferumo.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/47840700860.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/divamivufuxipijexejepajos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bb33a5c97---xufisodoga.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3f9834ea3---51227395937.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160705ca97ff71---vusujukejiwiruze.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d404926c448---91934821286.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b482fd6c49d---29376399861.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e91d14dcc---rubakazito.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/81016577440.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/27982578026.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/95376633584.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37d3fc2166---4471713229.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/58dcanh9i02s4r1dqf6hetljq7/22740583610.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c188176fa96---dogenuna.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083be43a6d46---zezetolezagevibemitux.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/fitoxefu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/72668891392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=esl+questions+for+beginnersPDF 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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 10596 bytes
SHA-256: 5d52703e6c0175a7319429ccc21c13207e1bf606f99423ec5e853ae4ccc1424b
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 18060 bytes
SHA-256: 8f99da2c09146228d21b4e1468088c4e710e5e04a2ea5b4300815d6b4314a937
font_02_sfnt_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1