Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a99b3cb3203229…

MALICIOUS

PDF

99.2 KB Created: 2021-08-01 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8590c2011584b7debc22da585c7fd6b9 SHA-1: 2f6c99875082dfc4e4a56022cff52653e67ff2fc SHA-256: b3a99b3cb320322940cfad210ae27768de7a78620d2d8b062f9a1d1ed3360143
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further payloads. No scripts were extracted, but the high number of suspicious URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://garglob.ru/uplcv?utm_term=what+is+tree+diagram+example PDF link annotation
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/34197855520.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd57a95916---fideku.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd930dcb4---95801548763.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/26v204eb85beikckt7kgs6kkc2/roguzafemafupiko.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e1n1k0nri1hh9t2n1ca9o3jjij/godezasubin.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ca6ab156---45113203445.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rirapajitimit.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/pujemakowosi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6af6aac5a729c9ac844c6962f8f63327/99557908164.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sixesewi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c7d286ee---xapekarutazuravelitukop.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/13496125599.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/lomikaduladojazovatuli.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/420c2de7ecf77780e0644cdaf0fd4da8/bifetobepiwaninizafisivon.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mduuhcqfdsci1ljkksp16fpflt/16485239124.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/bujebodunepomifediro.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/pifutet.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/34460685909.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kebosizelosepegebenusid.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e753671e9---5643265319.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f396cc4b78a0377a126be4c81cf09a49/jitijinovavoruneme.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/libax.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ced24dfe---juvux.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/28856115501.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/gurekasit.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nrojs4e99ng6g3atq443sh732t/11627467262.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16156 bytes
SHA-256: 2be9fc21d464779968742415929fc1019ef03d6745cbecd58f454716c6e4f645
font_02_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 10712 bytes
SHA-256: a0f4562c866c1f3ab3297677f2e86b96503a25703a18b61ab005a315b1b352d0
font_03_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 19156 bytes
SHA-256: 8e700eee80e6730a6d5b2e8251194b6a2e034ee72481c3fb8231a591ffc443d7

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