Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4a9d80b79e64a…

MALICIOUS

PDF

99.1 KB Created: 2021-09-21 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddc4656378094d4d10c525ebba8893e7 SHA-1: 97aa4ce8fdbffb5370361ff0b9da9a33e8c283b9 SHA-256: feb4a9d80b79e64a279e1c75eafe2e9d598f3280bb7efd3e4504e4fc2883c180
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent. The presence of embedded JavaScript points to T1059.007, and the nature of the document as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 6

  • 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://archism.ru/uplcv?utm_term=apk+mod+farmville+2 PDF link annotation
    • https://ncsccalgary.com/userfiles/files/pidosedonixi.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/guzitodewanewakiwogopu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/bolesuxetugeboletoze.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/poluxi.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/fasifo.pdfIn PDF document text
    • http://reichspfarrer.sk/file/65856034062.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tutavijim.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1efdaa8b0---sekowasopipubete.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/fegevipuvixumoxes.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ac475648---retikoviga.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/56570543614.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/20141071295.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/4342605062.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/7442225736.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bfecbde504678a2ba48056769550ce6c/wisemukijixurusapuve.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/motoxafarixuvuramezoxub.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/bazuwewolanez.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/50931095643.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/83453155394.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e62fa5798---4879653885.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/81273765065.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_F9688317D180DEFB.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c4699aee47929c71aff20e239c50888f/tudelixepijubilajalago.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e71fe6e022bee0aae2c07d6b08d4267d/31102285734.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b8jbq4opu10h0mlpp6qkgkk826/37952915069.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 16244 bytes
SHA-256: 2f3ad2976c1467397953e6f6c0a7ec60b4d813656883a1c398bc4582d1fdea6f
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 25028 bytes
SHA-256: 977d3b757dd8a7eca2aaaa60ad96b91dd6099135f6ffd9090ac7b6e13b6aa206
font_03_sfnt_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 10548 bytes
SHA-256: cfc569e0230441ccc0b45847b7134c43fe9caa526238756274489f82e0b77648
font_04_sfnt_off000165a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1