Malicious PDF — malware analysis report

Static analysis result for SHA-256 607719f291b60cd8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 14:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e65bbc40068c448137b248fc8adc5c27 SHA-1: d397792542d6d5ad0406570d56542ea164917efb SHA-256: 607719f291b60cd8d7cbfeb6aa4885459f3119b6e314e7f850ef7e726f3029bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of JavaScript suggests it's used to execute malicious actions, likely to redirect the user to a phishing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 http://jjw-led.com/userfiles/file/17143430730.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/818b40fb82c205498b38d18d14c093e0/89962377660.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/saduxesasogeziwojexo.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tobelos.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zigewikajujaxirovi.pdfIn PDF document text
    • http://alvitraders.com/files/8012774106.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/23603008312.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161410db30fe79---44991504496.pdfIn PDF document text
    • http://offerparts.com/upload/files/xuluxizo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63c8c900ab789a400bd5dcb3d1e3b3a7/84393761382.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92143607195.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/1445851485.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/dodafini.pdfIn PDF document text
    • https://people11people.gr/uploads/File/422324978.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0581e0d4c---lafovufivaxumavonumefev.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xerudigav.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/6262466010.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67008368821.pdfIn PDF document text
    • http://gabortech.com/admin/file/jebavipagerimelagenerejuv.pdfIn PDF document text
    • http://araratmebel.ru/img/file/37069375306.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/sagisukopiwixonejofebik.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/negeforurafupasiwomifoful.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/madoropiguwodafuviwele.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a4668676---57611940839.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/bekebipemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+2020+apk+for+androidPDF 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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 10360 bytes
SHA-256: 03e96bd40010e03b07e1e6c21d80d7dfe2c9b509ff7b6c03dce73a55a1218c23
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16792 bytes
SHA-256: cc53a773149cc1796105b5241cbfe96f543e4057b50d25d4ff3d3300a44b5e03