Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b886ee8e05ac2…

MALICIOUS

PDF

75.9 KB Created: 2021-05-17 21:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0046c10a1ce99559915fc59c5e479bd5 SHA-1: 22d9317c441b2ff2bbcd74fd93ce047a8ff4ec8f SHA-256: 819b886ee8e05ac28e835cfd8b9d26019a9e3f1f75b0089fd482b5c9dbdfb884
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608777eca1561---rolewosibusikej.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608407f59b5bd---15122243321.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/82979aae294ee7d5a06865eb45e2fbf8/lopuninumufivitoxipesol.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/senasobitowutujupaw.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef1f45653---vigitugifik.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/47217934592.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1a2a75914f30dc0559ed7f8333719a0a/butewobuvifidozezikida.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pf4v5l7d9g2n9r2b3t8ulid2sm/71881562589.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/16/file/20210516_141952_114.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/4364276866.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/017bb1bc868fa0ba4438c1688161c58e/93435544370.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943e505f8c1---zatewebavibugekipizubodid.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/70883009736.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/51c9rlfp5d7uu8s655r2t6er7g/11130875053.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/13d1258b825def319fd0692c8cbbe312/91714252589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=live+sports+hd+tv+app+for+androidPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 4888 bytes
SHA-256: 316d1a8c59aaaa0fdaffc41436f6fe5d9b4343454467b43749e82b7063c2f71b
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10528 bytes
SHA-256: f410cfdb19e4e46d2bb44dc4258b4040469391b283fe765260ac70f6207a49a3
font_02_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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