Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1bbc3e5b98af7…

MALICIOUS

PDF

79.2 KB Created: 2021-08-24 16:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3d6d22ed5dde89f58c8267e39693789 SHA-1: a34228c4c6a77c8f4ede932c2d29b3c316945d46 SHA-256: efd1bbc3e5b98af78d2447fe51d0f5fdce573534e83b76f63430027390d1c9f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://ketchas.ru/uplcv?utm_term=homescapes+stars+and+coins+generator PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c19924b1c---litotawivo.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/winiwoxefe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0476e6a2---vijiberosinod.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/lofurowuxoxatatetovemeji.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d79b12f8---derekagu.pdfIn PDF document text
    • http://svx.su/ffile/file/65381482079.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/zitogalulo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/takunobegeterajenikulolen.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/25482864092.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/gugawisilexinoro.pdfIn PDF document text
    • https://aashianarealty.com/file/viwubowavalovutusagogidij.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ofv3pk3dt6h9kvm4cn6f10l82e/bikexakitufekexezi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f539042f91---82016205327.pdfIn PDF document text
    • https://sambelteri.com/contents//files/28131842451.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b6ddeaee5564c6c0c95956b528b1285/74120668361.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/57759183665.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/10101614778.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/83246398375.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34dfab33a5---30526448992.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/18326070003.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/c1koi7dck12kvoo9p6hb14c8f7/gofofisuwuzuvasixubupopi.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210717051155.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bdd3924b9---buwolipasemevijikaxuvi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 10804 bytes
SHA-256: cea2d346c5359040c849858d7b3b84cebffa24640fab4750471ff02397ca1d88
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16012 bytes
SHA-256: 01b054ce1d38a126afe11bb2baeba2ad5fd815dbcb9047cd25b1422c9bfd46df

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