Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef70ed482dcb028c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 04:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aabfb479c1bd65fe7fa28c8270aebd6e SHA-1: 0188e31ec472d1fb00890609275eb2d48eeba2a4 SHA-256: ef70ed482dcb028c135db718de4dd009faab9a9bb82e0162824db2c38f811d57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=tom+and+jerry+hbo+max PDF link annotation
    • http://princeverma.in/uploads/files/mozanusakiwidupikaguvi.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/63916958841.pdfIn PDF document text
    • https://vzglavniki.net/data/file/99051997355.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/94865418932.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/muxurorowogibonuk.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/52877059731.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/fewojuxuwemakovovinir.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65159013032.pdfIn PDF document text
    • http://zuche0551.com/upload/file/faxadelener.pdfIn PDF document text
    • https://matricula.arendic.cl/files/78440023731.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/24532857680.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e197a00c4---kanumokelugogebabe.pdfIn PDF document text
    • http://ty-int.com/files/files/fefinawaxudiluzat.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/10117720288.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/monaxosajekorajuvarofe.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/rigixukejat.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/31030959900.pdfIn PDF document text
    • https://okazionche.com/files/34986444322.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/96818487539.pdfIn PDF document text
    • https://istanajp.net/contents/files/75340663783.pdfIn PDF document text
    • https://computerzone.pk/file/gajakozosetefexobisokis.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148249468cea---93504423459.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/61i7undlioqjhsg91dj5o5hihp/41960361138.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452389ed8b0---43837409050.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459eff60e9e---88689228499.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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 18668 bytes
SHA-256: 695c36da8a6b68b04588b10fb7c127d24763853759c935d4af8b1343c35e00e1
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 10556 bytes
SHA-256: 3936362c9741ead8feb2c288b577817a1c672028bb1de23ddd87835ec344951e
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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