Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a481d9fd5b380f3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5eee9116651511a54c0ddd8994e5c0e SHA-1: 8f452d86ee6b06cefd232ed4db0b2e1e993bf678 SHA-256: 9a481d9fd5b380f3bd4e6f8e8fdb1188d255966e8551c3a56baaa808ec71e6fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://web5gstore.com/Files/files/junufomeliwe.pdf
    • https://skvely-kup.cz/files/file/dowosan.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/88416704895.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c83138ca4---ditusasokivojopi.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/11152447529.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b8i167rkrb0b4mmqhaeo7fd3r1/80930752947.pdf
    • http://tiwtactic.com/userfiles/files/povewupesatagamutim.pdf
    • http://www.wiz-fac.com/uploadImg/file/14095005904.pdf
    • https://goodline.by/userfiles/file/kedomanapevomarizoruvi.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/ramenagubukeroxax.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c595b104---gogomawulenusazixifu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/255ecc7e9588beff707010499e541c8a/tuloriwuvesul.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fa74c38739cfc875e70490265ecf9d78/bepidin.pdf
    • https://securitydm.com/slicice/file/3877294806.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf66312a5b6---razuvakowe.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b488014374---312352066.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cccdc5b7d---bizepumilikirefabog.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/40204793259.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ea5fca8afa2bcc0aa1641d4ceb00f8b/fifima.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f3e1920cf781c28ddfc129e99f2fa7a2/32238809806.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/h247d312ta752f4ljmpu2ddvlo/87557404252.pdf
    • http://atek-ent.com/upload/file/diraxupijomivolida.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=graded+exercise+therapy+pdf
    • 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_off0000d6e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 16792 bytes
font_01_sfnt_off0000eefc.bin
d4cf69b244229032a3baf32528363918646fc0e72b64816964dc6737827524bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10704 bytes
font_02_sfnt_off000107bc.bin
568e8bcb440bcf44824350b7e1fee0bad304b0d92b8f9e1d90b9b580e7fde9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 17172 bytes