Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab659721bc32747…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 19:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7f614b659aeed280d9908f4769c9931 SHA-1: 627e572dbfeb3a96f802f5537c283a2925def877 SHA-256: dab659721bc32747aaf5460526c6e03d44e43086716c4709e02d6213a6edc65d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript, combined with the link farm heuristic, suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e1b3a149859b93de51ddf629873154e/98525175011.pdf In PDF document text
    • http://wooshin.kr/uploaded/file/81257246661343700a079d.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/togikobiduliwajodeku.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xewusuk.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161438c1a65396---26144701572.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dejetosaruf.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/67514627352.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140081c89d3a---86455130789.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/81465825973.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/nezelejidajaguwow.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/67635696378.pdfIn PDF document text
    • http://podarox.ru/public/files/77849320585.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rizaxedalogeposeginom.pdfIn PDF document text
    • http://lagrupacio.cat/file/18825137961.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/rirufajoxoba.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/4270171185.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/gotijinorelulelatemad.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/59202930991.pdfIn PDF document text
    • https://rm-parketi.si/uploads/28404382096.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/93033126554.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/35995600807.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/1755909985.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/kexabejozufiwumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+10+smartphone+under+15000+in+bangladeshPDF 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_off0000ade9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 15460 bytes
SHA-256: dcef704f7dadece13523c07cf96c46ca79257482d4682f0a87c4f210dbfefbea
font_02_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 11352 bytes
SHA-256: 0954ef94850f03ee7fb2196057623a6496e34d60d2e463dc425935ef0ff0fe22

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