Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88318e2eddd12ba…

MALICIOUS

PDF

76.3 KB Created: 2021-06-23 22:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e06fdb279d353e97fc09c64e948bcb14 SHA-1: 3c288cab402f5a4b8b900af34b51cbf3c2c31c64 SHA-256: a88318e2eddd12ba1b120c183814faceb8f734f4f77ba8e5cdb68d97ed880e35
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to potentially compromised websites, many of which host PDF files within WordPress formcraft plugin upload directories. The document body, though heavily obfuscated, appears to be a lure related to PDF editing, likely intended to trick users into downloading further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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 http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3365fbc345---654688390.pdf In PDF document text
    • http://absigorta.come/file/82318979282.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a54ec8c67---56290466306.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4961080f---vazokose.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/95050181334.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/gulowuguju.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/70052735642.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/31628111581.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511035534484631.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/38616217046.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/19237753094.pdfIn PDF document text
    • https://xistenze.com/files/files/fejunagidutokoxuvo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210519155950.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tg8a7lfotfct85i22sges3jul3/gujagasamupameje.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/rigukono.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cd64cdb668beefb86bfdb057be0862cc/vesun.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ef2e2ee0---89503082484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+black+something+out+on+a+pdfPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 5728 bytes
SHA-256: 4313fb0e997751cf089c0027faadc8e635419d48b3e153f07ffb733ca2ffebda
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10972 bytes
SHA-256: 9c7416c30dcf7a24883a5c264ca5d81e47f2d74d479c142234629d82167502bc