Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9b84a2fe4d3e49…

MALICIOUS

PDF

94.8 KB Created: 2021-09-01 17:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 966ad7c4d24cee9d57c72962493f9a5e SHA-1: 0fdd3e70ecf1e420656877b2cbfb66e418a459d4 SHA-256: ba9b84a2fe4d3e4994501e0f079a35ffcc50648f110b36cbcedf157730cdacfb
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, a common technique for distributing malicious content or conducting phishing. The ML classifier strongly indicated maliciousness, and heuristics identified the link farm structure and external URI usage. No scripts were extracted, but the document's structure and embedded URLs suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be74c294ef---xofibe.pdf In PDF document text
    • http://scan3dsaigon.com/upload/files/65993150181.pdfIn PDF document text
    • http://vtaky.sk/media/file/sabaselikaluvegapejuvan.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b24fb54d8ee---23223924679.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/58474321858.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083430081a87---jijesov.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/29658175648.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f00db94452c---33998805833.pdfIn PDF document text
    • http://netflor.pl/upload/File/48156977456.pdfIn PDF document text
    • http://iviltra.lt/images/files/korujazepufojoruxetoto.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/60206041513.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/71823192547.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6233b320d---66562330091.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8c444d08---89826659725.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a36c5476---fufexexasopazifatutakakuj.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/21798677239.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/14843799232.pdfIn PDF document text
    • https://fond.ru/userfiles/file/54643758178.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7df61ded77a9afb5fae7d3ca7a6941ca/delexakuvesevazaji.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/86912615731.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/27732401012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=all+day+tomorrowPDF 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_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10096 bytes
SHA-256: ca4e514a9df809ff132a1db2c12e9b8741640053de044de12e33d90868935495
font_01_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 17376 bytes
SHA-256: 70cc2976659406fa8d84d592ac3f361caea5505e4ca371d1311662986d580041
font_02_sfnt_off00015517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1