Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04d9bf62e73dd45…

MALICIOUS

PDF

90.1 KB Created: 2021-07-18 15:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 43be59881d5ea99d206d9a37008d3a75 SHA-1: 699f011526da0801d37a5635f0ef0ae2ff896537 SHA-256: d04d9bf62e73dd45627388ca97e723416b635b8980010d04b7cc5a6cf1659763
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains multiple links pointing to potentially compromised WordPress sites, suggesting an attempt to host and distribute a second-stage payload. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised infrastructure for malicious distribution. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7d09039d---jupisubepifewobopiziz.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88435426925.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/zadogeki.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/muvixajozofoxole.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/25542432737.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/loxexivopugo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/16107711820.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/kibisiviwilutewa.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9d0sq34jcg9o8u4pjp90niqopp/11937183959.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cb6a72cd---marom.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/25118196293.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/10789038660.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/63a835d1c1222fe5c8f47d68fd0314e5/94105840836.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c644717312158039ce52ea18d483bdf2/48040660949.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/88858683142.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160785c3e5271c---loliruxiwopixigiwe.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/taboforu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/wejimodexojegiz.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/10282000246.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ac546adc---vujojapu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/49438748263.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/10541195568.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d581aa9d4a9---22215897139.pdfIn PDF document text
    • http://eternoohydro.com/d/files/34817173634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=captain+america+the+serpent+societyPDF 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_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 17656 bytes
SHA-256: e898ea5e3b4bcf3d525c6f6d1e6f2b03c7655a1d05c2955c050ba3394d08b4b9
font_01_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 10740 bytes
SHA-256: 7d46fd37e2b7be6b64304bc14ac88995f43a160374516748761c9427a7edfd9d

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