Malicious PDF — malware analysis report

Static analysis result for SHA-256 244adcdda9b55f45…

MALICIOUS

PDF

70.1 KB Created: 2021-09-04 16:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d50e62b1520e375570d6f824d692d08 SHA-1: 52df26f05a53ee69c865733ff6757f5cf504a968 SHA-256: 244adcdda9b55f45809f29d0f1c75268f9417f94dcb8a7f39e80916661e2c612
164 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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pixomot.ru/uplcv?utm_term=vacuna+dtpa+para+embarazadas+pdf
    • http://stellamaris.cz/userfiles/reguroxoxurabes.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/33087683007.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/goxududetanenigavebasuru.pdf
    • https://next-engineering.com/userfiles/files/gemugu.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sdukcie5uonk7ndjr8gg4gdjgl/xalonukubumisaloto.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89f484733---rajavowafekot.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/bolebetabokilu.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/xawed.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/43552758465.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/dajej.pdf
    • https://airbays.com/userfiles/file/55227775831.pdf
    • http://safiorida.nl/operatori/userfiles/file/revujotofesipugofig.pdf
    • http://innotec-industrie.be/userfiles/file/lemonoketotavukoxoxif.pdf
    • http://yesilderecine.com/admin/editor_resim/file/jilixadonedexax.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160709c4f62823---96439750565.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/53051b4aed77dc73113c0ac0715c639a/mosuxemonejafatara.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8d7a17f1---55270302632.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161008773773be---56598064721.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3jo0fj7ek8o1ovu9vuqcub3pn9/fapafu.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ecv20mijf51687907la27098dh/98931268677.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/82de6db89ad85a4e64c23f73a3308352/86558944325.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/12696578858.pdf
    • http://gdgom.com/upload/file/210614072328107880vbdnmtvpltjw.pdf
    • http://capitaloffice.pl/fotki/file/42344819587.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745bb47830---tifuzesusudus.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf60d20d4---mobefeduluwitawikeluma.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 16792 bytes
font_01_sfnt_off0000cc7b.bin
e3676d43ceb8f53809d2295ce44b3b52adc65b581cf1e1880e7aa52533811068
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 15044 bytes
font_02_sfnt_off0000f21e.bin
ccf24efff6f55babc1c1e0ee0a970fb5448ba7df5f344a8cddb2b968a0912fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10792 bytes