Malicious PDF — malware analysis report

Static analysis result for SHA-256 b879f3cc98013c3a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 21:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa92b98c1c155ec1792610b35d327b3b SHA-1: 248c225bf692ab150850813bc7bc5d7cd4b44d98 SHA-256: b879f3cc98013c3a6f9ec9c3256d1a6d70b83e0ef3cfc2711793db813d0f8c89
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is designed to redirect the user to a series of external URLs. These URLs are hosted on compromised WordPress sites and form a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slovoveri.org/userfiles/naperabumulit.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a173fe94---resuzivos.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/mijave.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10895539668.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f76cdc475---welepukagugiremuravokeni.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/fevalokumarajefelofiromon.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/22625639245.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/20082354591.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090516272754.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sibarajevewoxamup.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99002021453.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/melopunubakupivimepax.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/19462631014.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nosadekemibolato.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa7c7107d---zajunafigatilaz.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/14837867499.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/peludajulatewo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zapomewasetu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/80391209073.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/nodebemupegi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/41381570904.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/xuzokixuzavenenugatedeloz.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/23661368316.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/53869343206.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea7a9efb5---wagojumezajeped.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/16992887028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=instagram+viewer+private+accountPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10876 bytes
SHA-256: 0942a3a9bdd0ded831da69584b289aebac8eb8a179b77ffaf3a8ec7f683ea972
font_02_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 17576 bytes
SHA-256: 1946a84926d764bf6cd54f5f40a9e0833f257f7bf1e8979329f772638b769e93

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