Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebc7d8b4416ba5b…

MALICIOUS

PDF

94.0 KB Created: 2021-07-17 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36ce5f82e6bbf1311a676590b9c38118 SHA-1: a101ac36520065a3b16d9b44d231eaf7990ad527 SHA-256: 4ebc7d8b4416ba5b6033bbbb55f987f5b7b360ee24adbdec47f163e20b64c0de
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://malbreil.com/userfiles/file/9673180752.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ift0ouo7vsmoi6nskksmjcqqi4/sofikinimofoxepolutejugi.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae678b76b54---16516052476.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63480e17b6---14700107337.pdf
    • http://minicabii.com/survey/userfiles/files/nawavunap.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a225b96b5ee---tidudivukadesapi.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2a97ea0b---suwusowogurafoxoretu.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bccv495g42s60kpofvd2g1soku/pivikozukivosiwopojali.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/29562f24b1a77b96732da1448281704e/laxijalusomofubarer.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d93787e64---kenevawowageferepe.pdf
    • http://allmedicus.com/userfiles/file/lewomirerixuwede.pdf
    • http://bhs1966maui.com/clients/64750/File/bogisipesaj.pdf
    • https://travelworld.ro/userfiles/file/13061367241.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/af5e157fd5e929cb258413a1be5c93a6/42194509360.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/35644553709.pdf
    • http://bjallstar.com/upload/file/tumavis.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075459fa207a---71569294915.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6c93e8e8---livajov.pdf
    • http://4bx.pl/public/file/58508404457.pdf
    • http://angelcabrera.com/FCKfiles/file/joterexum.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e801f6f1b6---15480584764.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/55qq6o64gfqjv4p5bdtp79fmtd/pisisabopiwubil.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b231765329e---gikiv.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099332c8a6ed---nezimedolu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=long+word+that+starts+with+h
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb0.bin
af554e12996b7549be409303eff9ea34442935d706b5bdb8bca1e5b36dc57e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10392 bytes
font_01_sfnt_off000104fa.bin
4012223a6e314a4a46d26a024e10bb5874925e0da4c9329695a9988ff3d32ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16424 bytes
font_02_sfnt_off00011bc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
font_03_sfnt_off000133d3.bin
2be3d47f28c100560d59a1132af934bf3871bb3c769514df3b14adf4cb801cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 21096 bytes