Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e61f076feddba25…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 03:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e289a956371120fece761cf7c0e002ce SHA-1: 96fc65932b419d98c77b6f624b993bdaf73049b6 SHA-256: 1e61f076feddba252d8e58f193eb2237263439ab85ab8c70602c2358492ae290
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 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://silky.ae/images/bulk_images/files/34758948364.pdf In PDF document text
    • http://ecole-belair.com/ecole/file/84190785131.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/27865738233.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/muzaseb.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/woded.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607837775bdb9---pavololizumivafusewa.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2122fe07a351841366d37c47a5157351/90184085566.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bavamawiw.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/loxidadikasaxulonotisugu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/negumesukajusopakum.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/59679862417.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/98557680828.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797dbfeb287---mukukemopufenop.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/zezenufomurizilumuzuta.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/10469624375.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a66cdcc8ff9c25b446c265cb84a35470/papawafe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/bowedofazikewas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f864a6ff7---mekevubedefom.pdfIn PDF document text
    • https://sealskinz.ru/files/file/wasube.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/batopesubotovugef.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816c0152f4a---wapoxuboguxivafetutujum.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4f2994f44---vubuzemarexiwudoxejejot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=my+funny+valentine+chet+baker+pdfPDF link annotation
    • 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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 10936 bytes
SHA-256: a1199121e1f6372bb5846e91b747233d1cc0e91fbf44593eb57d1eacefe2fae5
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 20040 bytes
SHA-256: ac9c46a3d9c2ebac9c2e0e2a69ca8445dae6a437b30d27f02c3ad72a209e2f68
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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