Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e94c8335f94b6a…

MALICIOUS

PDF

120.6 KB Created: 2021-08-09 13:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00a63ff73a263031555cfc03ba595692 SHA-1: 39f70c2ca7b312895a5b51e9160e801ac46ab023 SHA-256: 87e94c8335f94b6a543fc2676249b9a3512dc85ed4b02b06e16205b3ab9636c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=mapa+mundi+con+sus+nombres+blanco+y+negro PDF link annotation
    • http://12shio5.com/contents//files/15857129129.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/leliwitezekobege.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/69509851082.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ahul2tb3a6surmt222kij6qdh4/zedowa.pdfIn PDF document text
    • http://adveotec.com/img/file/gatoxuxoziw.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d24dbdc385aaee54435959457f59e823/83042969535.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/df2c2568b2184e5d0cacdfd212ff1e78/gupiloxitemarunu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/be69d20543e15be2b7d5bc11869e2e0e/batuzenaxolujeworuta.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/d80di87heahc2ls9h2kh4i0c7o/24042569125.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0e8a8e7cb366a04151a9604b41639504/tafegevewax.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/91589312250.pdfIn PDF document text
    • http://takipcisec.com/calisma2/files/uploads/jiliso.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853c60e567---36455194058.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/tuwijiwoduwega.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fdfecd224ae299059aa8f80744acfb70/nawegomuxaxu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe3c3e64f---rajaboren.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b26794513112fb0e0f2d32ae0c5f610e/musarigojujejulopik.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609863ede74b4---96260396565.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ec6b7beb---karip.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b8c1676d4---43450555421.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wofetapetub.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fuxedabukokexetuxawabiku.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6f1ee386f75b463acf77ae7782fad130/zizexevoladoboni.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_off00016e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18681 19724 bytes
SHA-256: e11155ff81ff5f63c592ba7140dac25d58e2c3d3046a2f3817f3e55f4cbae8a3
font_02_sfnt_off0001b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B898 11104 bytes
SHA-256: bac12995ba061008f752ce07a41684e8bb9cdc154108ac586978098bc68bf3b4

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