Malicious PDF — malware analysis report

Static analysis result for SHA-256 149d39604fbce345…

MALICIOUS

PDF

86.2 KB Created: 2021-07-24 18:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90758ab729e17552496da34f3421f99e SHA-1: 5f393bc73a51c731bbcec5a9bec98fbd2e6b7492 SHA-256: 149d39604fbce3456faf4aca43eacbf131f19e642e6fc4518835d3e4192ea4b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these compromised sites to host or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66403b2ec0ec0fadd1e5fb6e5ceab18b/73324456782.pdf In PDF document text
    • http://choinka4x4.org/cms/files/file/mefomumorazovabokiwekiku.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2543e388b---jakudamifalakig.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3d083dd7---89240779895.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc4cccdf8---dukagaxigojesozipix.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210706010725.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/97516309621.pdfIn PDF document text
    • http://dhf-china.com/d/files/parogeji.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/73655548068.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f12908d15---katodiw.pdfIn PDF document text
    • https://daismene.it/file/19672228764.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n3oa1q38em9v0jj65l6giaaki6/85373734342.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/040951137260.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/37122676326.pdfIn PDF document text
    • https://cecprint.com/images/file/41157885647.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/71196394149.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077f54101fa5---37860802803.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/431953296.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kixototewowakavu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8090348827.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b7f6ef13---jibeza.pdfIn PDF document text
    • http://mebco.ru/images/file/85475559283.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3193d1daa7---95967093717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+pray+the+rosary+when+someone+is+dyingPDF 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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 10984 bytes
SHA-256: 6e345fa235ee97e51ed2eb95dd057052253ae47b6b40719ef3cccadb1757f5e1
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 17184 bytes
SHA-256: 513bb2b617fb76f633eaea1c934812cdb0b0c749d42da7785dc6934c7faf9807

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