Malicious PDF — malware analysis report

Static analysis result for SHA-256 3833c359a2371302…

MALICIOUS

PDF

89.3 KB Created: 2021-08-07 15:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b55d7b6b703804925f72a3ad7a16dd44 SHA-1: 5e4dbc4b75ac03c737931fb83d69d7c78fb6f515 SHA-256: 3833c359a2371302656c343e1661aae3c697c36567cad0fb3d564b3b13d6ed89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66c76b9eb1---7126389546.pdf In PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/xuzulerisomunerimawinuli.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/jamotibupad.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/37550378980.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a444b075cd5323628cc3ea68e216e90d/83362242801.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607765a5d0f38---dekakufusap.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/1023206650.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5th7ol2bnvp43r2ek1ua66urm7/18012214953.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a111a1242b---nimirilororavi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6e561e520a76f9b3929002001a1edc60/powebaxixumo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc617a4f78c---39413503543.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7l6pq8mdgua7l04c5tfmbf4os7/88939529814.pdfIn PDF document text
    • http://islandpointfl.com/userimages/refagofegijasi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fe3da1a946f7e3bf74a7cab2f07d0a7f/jimevuzipilewinojinado.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76961383037.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6c2813873eb16dd3566aa18cd7fb3278/lujug.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079acc112ae2---85054805015.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5f08bdc0---pukuvadirer.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/95722834874.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mebuxilokoka.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a71705458c0---71691290191.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/60089387838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+descobrir+a+senha+do+wifi+pelo+celular+-+j%C3%A1+conectado+appPDF 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 19196 bytes
SHA-256: 28488444c74c8eb5856d7c830a9fd215c716bc7684ca9b4c280b55fdda7f5a5d
font_02_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 11588 bytes
SHA-256: 6e00068b6ce02e88535e157bfc55083bc4cae66f6ccfa6df32fa8285f260804c

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