Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d682805b236047…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 11:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f7aaba3bbfe8b22a919f65135ece2eb SHA-1: 41a5711d1e2e685875830710024c0ad2aacdb682 SHA-256: e1d682805b236047de0e144f88af61920e08633ada4e3b73eedfbb18aaa76e86
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and link distribution align with techniques used for initial access via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://a1-recruitment.fr/v2011/Files/fck_upload/file/kokuweka.pdf In PDF document text
    • https://asken.as/bilder/file/lisidiwezameruxizugeves.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8341ee6b1fa3896e682aaf22911db22f/mebapupuf.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/q8eh0vhphdtavcc8j8nk2jevl4/64350360539.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/13392896138.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/dafeliwonodisow.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/20767756583.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/wixibed.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c55c270740d---sipeperefukole.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0gtsc91olgasnqt8t5a3oi9lg0/lugutina.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3a7a6e414d7824c02b8ff7ccb6fe3b55/38336318540.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/disiwoxoritipulanob.pdfIn PDF document text
    • http://wdnederland.nl/file/56563306661.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2ifeqh6goudkmqcbk25js5co20/mufugazazurum.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c479670be3---45098876064.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/8488946097.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49320d621---womomulo.pdfIn PDF document text
    • https://redac.ch/upload/bimigugozesovuvibired.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/9945305669.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160959a63e4692---95298955872.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18830211a---10278954493.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/60801680236.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99590756123.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/kuvejetet.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae1d24ece---tolavinowuxerugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=visual+complex+analysis+by+tristan+needhamPDF 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_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 11204 bytes
SHA-256: 4172eb9abb948614dfd7c0432533896464e3d0c630cca93b69ef796600d8ce9e
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 17180 bytes
SHA-256: e2915ebe562797663f06984e66f485388b1a79720e0cf42b056001d78c2dc99b
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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