Malicious PDF — malware analysis report

Static analysis result for SHA-256 155aa242c5c8ff3c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 11:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8ff598f8daaa40314e67591818a1f76 SHA-1: 55a765d0da888cd74c2767442996d015582d5d0b SHA-256: 155aa242c5c8ff3c85efd2882fcc370eb01ba94b649e48affb0705832de2f00f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to obtain a password for a separate malicious archive, a common tactic for evading gateway security. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=wifi+password+hack+tool+android PDF link annotation
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/73445300690.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/mamojepulapitebopow.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef977aa6b---xusufuvoborex.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6cf9a1f9---puxuxukuziwuxosona.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/71551715592.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/savitiwibosupolilorizut.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/15739967767.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/28718306190.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/notiwubimuv.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/tofenimufafokad.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff4b3ad00---vomanedunitamepivupu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lizupebajijikasago.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/82666652852.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2a50606e---1218108987.pdfIn PDF document text
    • https://razredna-nastava.net/files/bajabugogalotugasonenela.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b367bace8---gisumefixexas.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/83365266502.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/dezinomelap.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/xukataromakel.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/9715968562.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/jesuvafodilivipekiso.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/ledizinumatoraveni.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/44877608297.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vozabegilimifepoxakeradam.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/38756519441.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10756 bytes
SHA-256: 214e0b0b4edc2fba33ba4bfeda4a01f369d78087758644dd3965e462211f47dd
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 18284 bytes
SHA-256: 84b7119275d163c74c1f56a06ee92045ac9888daac62515dcd7a722596eda016

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