Malicious PDF — malware analysis report

Static analysis result for SHA-256 9221724e5e359b9a…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04ab3d74d5cf7f862372d99167645ebe SHA-1: d90ae55bad45d90e3bc6334071ab8a404afe2d34 SHA-256: 9221724e5e359b9a44211be178675bfd58c30ee267a0b7a0845462253fa86ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160979f20d1cda---gunegibenizo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iscuigsv4oq71onokpcsft3kl2/nexonaraninobax.pdf
    • http://doktor-okonski.pl/uploadimg/file/3091506445.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2b538b6---11887369865.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c567170f42---84931128046.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abc629c11---18377101659.pdf
    • https://bursac.net/userfiles/file/21969245605.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i47ldqsuodkqb7rmmplgek8gf0/3214380234.pdf
    • https://colakcivi.com/userfiles/file/kososavonin.pdf
    • http://jullien38.com/ressource/site-image/files/kudolamalefoxukinis.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075806a1265c---92995471225.pdf
    • http://andlupa.com/userfiles/file/wusamamunaruwa.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4d740077---49936807392.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074193e27d14---65179134519.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9279e5fad0---79851371269.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078193096a3d---fizeromifenowobix.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/da3ce099af5fae985767feaadd3b9436/makasumunedabadone.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c5867a56f40---25855690561.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a212c5b2283---sefabusu.pdf
    • http://robalton.es/Albums/images/file///wevetobinikajigek.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c4ssihotm9sl63lnm8gkq7v8hr/84593739708.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d468f98d27---riwozesowixigalugazevu.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tn94ra85lpurqissga8emiu35/xojodaxilajarevexov.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ce394c43---fupebiwegifirodizuti.pdf
    • http://zeroseistudio.eu/userfiles/files/61137885940.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/93mgona1vr6unk4c55pudtglh5/11203259151.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=isothermal+process+heat
    • 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_off0000ec1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
font_01_sfnt_off00010434.bin
21c2de72c5e136761d6b280c3c2d942c772797c7c1847d6005d51b18d4532490
pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10396 bytes
font_02_sfnt_off00011bc6.bin
43694896a728ff94acf569aff8205643d5cbf08757c4cd724a157d10f6c4e00e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 17760 bytes