Malicious PDF — malware analysis report

Static analysis result for SHA-256 e878d8efa425fa28…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 20:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c20d87fd5f7ffb155bd6dfc86df149d8 SHA-1: 702a29ef653bce334404bd5934ef952c6bf750d2 SHA-256: e878d8efa425fa288b5586eabf8904cd70ad14ffb768754ad407179dfbbcfc4d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, which directs users to external URLs. The presence of numerous links pointing to compromised CMS uploads and disposable hosting further supports its malicious intent. The ML classifier and ClamAV detection strongly indicate a malicious PDF, likely used to deliver a phishing payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://wastran.ru/uplcv?utm_term=introduction+to+probability+and+statistics+for+engineers+and+scientists+5th+edition+solutions PDF link annotation
    • https://mimpisiluman.com/contents/files/zigawelevufidak.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8631078a0---fezizimopizuvilu.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jutoboxosexemepini.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a5585674---vupulobepur.pdfIn PDF document text
    • https://t2sc.me/userfiles/vobupesifod.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/kajexisebirolejarawixun.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/19419513562.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/80681866610.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/79890644000.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xevogenupi.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99675910987.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nifuseretebuziwuwe.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/lunegebuvuzuvu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8d09f028b181834809ee729a9d709b0b/12591985252.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/fiviv.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lanubenuxesizobuvajiji.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/joboxizapujid.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/webarakixojuwanemabadid.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/wotupopepafebafizo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/nisaxaxav.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/vumiperobuwiririxe.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/fizisofavemugojipes.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/tuliniw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF69 11340 bytes
SHA-256: 427b0052d5314abaa8d234da8233fb64e4e63a1d118446f85e4e074589c668bd
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 13928 bytes
SHA-256: 01e3285c8613c1136446e39bcd49417f884627d2edf1873a21f2ad409ef6daa2
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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