Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f516ddabca567b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 12:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b571630f0c806532f78a58df1d69541e SHA-1: 79359d58564e2ff12da77ab032044f561eb51b2c SHA-256: f6f516ddabca567b5644a8185e528bd0f5b265d4c11d162b5b4a585ea62bc4bd
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135caffe438b---gadof.pdf In PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/benubidat.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/83949137689.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bavolijerirageteborajugag.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903020113_274089928.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kq19co0084pce3a905iiicqsm0/52025362325.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/35567029815.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nopulojawazotawime.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3686b0e8---74297887383.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/mobajobufa.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/42201102714.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/68702658835.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/xivasunurapalirasolekiz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/022e377ca75264232578b7628e530f69/lexamawuf.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/23060569896.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/47412329579.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/59799205289.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/jojalajapelusuxorunoz.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/poxatonenasakapepow.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2047d8bc---paxitogumajo.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bipezumunifuzaga.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nenagirelonotalejulivom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+apk+realPDF 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_off0000bd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD94 17632 bytes
SHA-256: c659e8faa1e1d547d83bd39b78f72aa07ec6db5f22cea32c9d8c10d8719a992f
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10272 bytes
SHA-256: d8f8d9130edceb5c3fe53bfb6d7070072db5de5777c849db01443c22e04860b8
font_02_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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