Malicious PDF — malware analysis report

Static analysis result for SHA-256 937cf029ec206736…

MALICIOUS

PDF

85.1 KB Created: 2021-07-20 23:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d7c24587542456e355c6a0518f634f7 SHA-1: 320b389fc37e9913c784693eed407fae4e7b9003 SHA-256: 937cf029ec2067364208a86b14a526cef9432fae97a27f466301ce2bf59d84a9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. The ML classifier strongly identified this PDF as malicious. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phish users by directing them to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i05r2ii0vjql5jv1su50pdvhhg/vepurekepeto.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d9b7a74c---bavamorilijesaped.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/35412738910.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160750f40b3237---17281805769.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7acc2744fb---duneriwetudogosimexeko.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xiwej.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39fc37f18---10134063772.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/wujexuzasus.pdfIn PDF document text
    • http://falerisztika.hu/tmp/6384831289.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3230b884b---69100581683.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/74efcb63b0e6980550ec5146349d6a1b/jegujazotujedugevuragawom.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c640f3d2c53---30570476674.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/35166339638.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/73318507633.pdfIn PDF document text
    • https://x-software.cz/data/file/93875885695.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944fbe1839e---91488755520.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160945fa37e7a9---xinijisamozevip.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3k9j5bfi89dcuk3o7k5ml4tp25/79163679194.pdfIn PDF document text
    • http://splogservice.ru/content/file/22331453941.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2e0e61e9373598a6365dba468c96ab62/2406281817.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/aa31df83c237519831f9374b0735259b/89217132801.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1839d3ad86---wowemupovuzorubiduziratip.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/rerofogumiperizazosov.pdfIn PDF document text
    • http://aweibel.com/Photo/file/vipam.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/78011309921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=if+mother+is+rh+negative+and+baby+is+rh+positivePDF 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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 11172 bytes
SHA-256: 8322057e43b94d7a8f5118789cee327ae535b7f008598e46fd4449c4833ad937
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16496 bytes
SHA-256: 52d493a97478dbb585b962afa85b1a766c4a734d98dd4d94134ad6ebd0bd6c25
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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