Malicious PDF — malware analysis report

Static analysis result for SHA-256 322a3c547f9dd7b2…

MALICIOUS

PDF

78.1 KB Created: 2021-08-23 20:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0630d324180ad39585fd4fbf82d551a SHA-1: 2e0f974af6d58bc9394cf8f0586b6e1e015fd74d SHA-256: 322a3c547f9dd7b2af2c0dc8e4f24479ee9e4ba04103d18d60966bbdfb3b07e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs are likely used to distribute phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=thistle+and+fern PDF link annotation
    • http://botosani.ro/img/uploads/file/janofurejizuvekumivu.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kidowitujoriwebumogaje.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/gekafikonuwawekanetora.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/64168339516.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e23eb098---28400708570.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a7cf3686300d33a81514e6d71308dfea/rimipobomufif.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/koxatijejotubuzedolazaj.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t2vd0ne41uqigj6538ok1670o4/fatibaxigupuluwosane.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16102be6e4e81e---nidenopevigirarakaku.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9759a65fac---67832091319.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5m86mvmpa648hr9tklp18r1rac/43318878200.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fosinufapedotuz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe54a29bdb9520123f82d35eb9b6eea2/dokofepunikadi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/31686452300.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8tud36ed8jjpksp1kgkvi4b92l/20130393687.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6b85d183---pinogegelukegu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acfda15b47c---35326029712.pdfIn PDF document text
    • https://grandegroup.net/files/17031848079.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s584mrm9kcls9730nkq7j1bkma/melesiduziko.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e461cb6decc8b0b59ad046ec9fc3c0e1/lafenerezizisubosikukuki.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/58852770221.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7b46c4f2cdcc08b3a54e3604852fabb8/zujosomelosudazeburosadi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/01f67001975c97773ab28c3922a405b6/rowag.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/laxiwejodupuvexomu.pdfIn PDF document text
    • 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_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 16472 bytes
SHA-256: 4475877be9d537b4b57dd374729a866596b6555269b717721b3891c2e24f8ae2
font_02_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 10296 bytes
SHA-256: 438c3dcc2415ecd408dce148a69e594e2f26041b206f56c4cb33c3c9724edc71

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