Malicious PDF — malware analysis report

Static analysis result for SHA-256 3261b8c746abc486…

MALICIOUS

PDF

89.9 KB Created: 2021-08-04 16:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8537946811cad231054f32ead4526408 SHA-1: 1f0814ece45a458b4032ca7ce198034b65953a08 SHA-256: 3261b8c746abc486508745ff0a7f950419ddf829aae6576ec2081e2dbcecae96
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links, combined with the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic, strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcce79272b---11667501163.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00a5a624e---jewizidowagu.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1fb511fcc---besosagulixisaziwuwegezad.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/hkrkqrmljdb9amm5hnia15mps7/xukereposasamelu.pdf
    • http://ekotronic.eu/files/file/51552523236.pdf
    • http://scro.ru/pic/file/movefuwafo.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/8303853156.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8iruf9lj2ka64mvkjehfrl3462/19739206185.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62e3859168---35755802739.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/41669834836.pdf
    • https://tecnicadovolante.com/images/file/60193760633.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gugawolibebojese.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3ue5c3vo4h1rsoh7o937pjtc4/3446646613.pdf
    • http://susanjeske.com/clients/82887/File/83037201190.pdf
    • https://gangnampools.com/contents//files/88632608853.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba0f9cab5---39831218260.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/92299995caa05034c36647750af7d66a/wotupizoz.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f3f1547ab1ff87d96757de8de5a72f7e/95486595109.pdf
    • http://kbchina.de/upload/tivadodadozexadiwotiwojav.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/811e84ab2c9f596d1da99f9843e17433/xexola.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac21c87f5fa1bdaa345dae3aaa5025a6/50234693412.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/99586095137.pdf
    • http://royalgroup.at/tmp/jofixibevodezuv.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/kuvarapofiwurirefavazat.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/89defa45448cf4016c839e473c5a346e/vibijibez.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4dc718b4---74042101808.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=accrued+payroll+expense+journal+entry
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
font_01_sfnt_off00011142.bin
2e18fdfb8c88207e98d80ebaec7486b0f28d4279a6c78905443e34eb5fba3ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 10844 bytes
font_02_sfnt_off00012a85.bin
7fd44b41f627a3194a3e88584a12c2446095929a9ffa1d3130fd33f9ec3fa7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 17184 bytes