Malicious PDF — malware analysis report

Static analysis result for SHA-256 360ce804546280b3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 04:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d42b8a2152252d9013a9f0ebd6aa05ba SHA-1: 9684fbc850dbd2bc8559ab5f806b0ca7dafbd368 SHA-256: 360ce804546280b3dd87c3b5561bccc30ecc3690bc1ff32ce1ecc8919518f28c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm and the nature of the URLs point towards a tactic of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lodoshosting.com/calisma2/files/uploads/85357662932.pdf In PDF document text
    • https://akconta.com/uploads/files/83867339844.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/33079295376.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/54794366045.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lujamiputukukamon.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/29a5fac865ee6729c73155dad1742c8b/lasaxemigazetaviwi.pdfIn PDF document text
    • https://slide-bearing.com/d/files/87503269668.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/jamadowugosen.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080114150838.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/koxejileziwipitiworexi.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/mefopofepibigusifu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e37bd10f---zimisivedagof.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad23249110---93184018196.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43536e3f5b---xebex.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f9cae3e5---12480991429.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af26bb3aa---gezun.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/64886760829.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9lafmqq5sh45c5pkb6fjeiirgt/77314373197.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/8108766169.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/91807194798.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/tijunoseta.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/48909870595.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7baefbcc3f77b7eba1f52963867b9337/98748497691.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a75d5b5488fa8560b0a52238ae81cb/33842067098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=auriculas+y+ventriculos+pdfPDF 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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 18908 bytes
SHA-256: 2dd7e2b189d3559bf843bd0e32d8b83979b630c0f704f7d45e5f2383e3e5a999
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10872 bytes
SHA-256: a5664e870af4a13c608c28dc7e2ab19405c10ab8e298531c1d45b0b87445b30d