Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbb935a4c3bc5cf…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 23:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61ebdfc8180441e444d62d1ea094a3dd SHA-1: 778bf30ae53c1ecc6b96d6246bac688d8ae4c17d SHA-256: 1bbb935a4c3bc5cf53b92537995cb6100630094f28c3e0a221a0be542eb344ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a collection of potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://xn--80ag1a2a.xn--p1ai/files/file/pesevapuniwuxexobatiwiwo.pdf In PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50789252379.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/5072582033.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9927150195.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/komesexob.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/16406050774.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/68205063788.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/xijabobapo.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/zegalepiwexonowusitofo.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kutizoranumetenozoz.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/mevekexeperakomunig.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f49788307---kozesigefituponejina.pdfIn PDF document text
    • https://stvorki.ru/files/file/buxawofu.pdfIn PDF document text
    • http://skia22.ru/pic/file/26935568881.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mudulofejibudelemifewo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109070043246187.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kosepijusibozokopal.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d4c24e4b---62930062884.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161387a8c4d75c---68962862692.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/damebagakokavedox.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/22909769314.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/roxusexiwezaguroz.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109162046066770.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/58c071c62a267bb2a9e75d184e7ed682/47588623598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=energy+forms+and+changes+simulation+answer+key+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e84fbb2b4e41e1de579c1797c9326f01/23612005817.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 11440 bytes
SHA-256: f0763d8933a10fc76acf6abbeab9d8962dbf8e40b6af213a974e0de51d946774
font_02_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 17628 bytes
SHA-256: 4b52b593653676fe2ca9edd239f9679b340d8b188fd5fc69a4e27ed29caa4701

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