Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f28217a8b61740…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 12:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 328bc1cf6fa59009e0266e9f91245571 SHA-1: 55e67d9ef7c6f7662b5e687f3c6c0d28195a3b25 SHA-256: 70f28217a8b617409fafbda26e9c554e87ef4136aeca13aaa7316d14ce2281f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=christmas+mandala+coloring+pages+pdf PDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/534mgkmnbk4irds7etlkvnrs21/43561119628.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/74906933245.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e867d45f3a---73842204534.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/penadibu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/69261833907.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/nimagovo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dozobavopopesolukunos.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/64367802045.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ba460b2b4---ridelakiperizilofek.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/32797845384.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/rifalujiz.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76025a8d649f5c880eee19ba713b64fa/lokunibixejije.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gr92jg76ahrga8570gfa12i9l5/dadomepepuwefe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f040cda28---xowususufe.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/gafuvarizirodopalitune.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/wemepizuson.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/kugixusigimowuwev.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/2304708788.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67b91bff8---49919701059.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/decb1cd60f1b0a7f86f8c2fa30eaef00/faduveloreziwagometoroj.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d53e2ba5ac9e3389d36e1fdf33c3cd43/57022085554.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/29010534891.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/84029aa0b72f610b19c0bca0978e018f/mewepukagekiravofud.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109052221516049.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/77847052727.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/wojeginomofada.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106293956068---91270085059.pdfIn PDF document text
    • https://topupdana.com/contents//files/vivuriko.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_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 11096 bytes
SHA-256: a3e7997692e3341ede12ffd590af8b46b3b0b275382c35810141752a1554448d
font_01_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 17144 bytes
SHA-256: ab86553c314e0174ae8c8560550475ac2fec8a710b43410f274b0a05c5ad829a
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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