Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64da366872de09e…

MALICIOUS

PDF

129.2 KB Created: 2021-09-03 14:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a7d6975fb0c1a877e3c5223328fd56b SHA-1: 5bc122b2e5cb5044156b179d59fe8140991b3e21 SHA-256: a64da366872de09e6c79a9876ecc5ad2ce9834bf45ac655324697a5f1148abfe
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document likely attempts to trick users into revealing sensitive recovery information. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or credential-stealing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1a3540e0645d3856053be58700edf6bd/sosigibuvogilif.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afb842234---355433388.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d855d2a85df3bd5bca799f70960f876f/lojupizipipek.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/48760344555.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/soribekuleniwomo.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601024809.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b165c0da0db---jamofugojuvowosalujaz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc61c090f396d1f8717c4a52a5cc051f/78368452239.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/melivibunebexexozurire.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/103229f4f200203d22b89db6fdf5af9f/54554478447.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zizeros.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/navovozefaxifosagotaxubam.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89da3f292---31452660298.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/fisutarokojavivox.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c579090f.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/vavijupijojiretu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/dujomatatufu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c03b5eda---37683474527.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46202301912.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/negefubusudijomulidanuj.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210528010410.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/60074310074.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/welopasuwewinejez.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/periruwegodegutixugoge.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/70151119852.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mapudino.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/26286808366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aix+commands+reference+manualPDF 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_off0001920d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1920D 10720 bytes
SHA-256: 1a3592e6c4bdb47242019ec93c829314ddee7c44cbf788950b1d702844d4c2a6
font_01_sfnt_off0001aaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BE 19636 bytes
SHA-256: 3e68678807f7cfcd24e244e7efe28e2a704231025e5b491a6cd66ddcb7535ef0

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