Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18f624af8f6b5ac…

MALICIOUS

PDF

95.4 KB Created: 2021-07-24 08:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39015b177eb60cbda03bb8018985c401 SHA-1: db1edd02e65b65ec2812a0e9f3f3c8001d64fcfb SHA-256: a18f624af8f6b5ac40daa712508f04f7442eaff24ccb9ac3eee1db4b365201e9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://hncastlecable.com/d/files/boxejulola.pdf In PDF document text
    • https://oxi-dental.ro/imagini_ws/65126746347.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9hl9qs5e9ql8p7v4486f8jbj60/wapuwekase.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ac8lda1sli7mj8dsgd5qhsp0s3/78200886635.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c05206e2ccd7916cdb8c307fc82448f7/55713731210.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5989fba03e---43267246456.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/37573305256.pdfIn PDF document text
    • http://huiking.cn/uploads/file/140957265557.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160922781617a5---63905048523.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/rejikuvosanibodamolita.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/tulitalotobokelukinuwi.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/31393668376.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/lifur.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1646b503d77f2b2dfc714eea2a559ffc/72820498493.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210702_064538.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/pekagikasununabufinidutak.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5585b1f3---92918893928.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/91290754090.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/bokejogilojariroratudeb.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/99njgibqmpusubkmm58j1dvut2/91441371257.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/82178264133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sunky+the+game+jogos+360PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 19268 bytes
SHA-256: 8a3a0e6b39ef911e9507b78f592c513b43d629e7889af3cc00e9368d5fad01f2
font_01_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 11288 bytes
SHA-256: fd4fb8e8ad7ff36540fca2cca5cddd4992be0784e43ccb3d14a32e0276290050
font_03_sfnt_off00015590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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