Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff788214e203516…

MALICIOUS

PDF

105.0 KB Created: 2021-07-22 08:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f8d1517d17c7597d48540041e68e212a SHA-1: f27b25bd250d452d881e790415ef7ad1e07d47ae SHA-256: 8ff788214e203516385ccf7f48502e32fa9c9592214c83fa9267f49071f7ec25
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs suggests a broad campaign to lure victims to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160964968ac109---48970953043.pdf In PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/wovuxubivalexu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/42026939809.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tl872oo15t6c3ms5iono4cp45b/jufokulusifatijupoz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16beee5f4---2808935097.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/676213853.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/97705583710.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/niromedepinonevik.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/88087230529.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721ac2e6c6f---34565993996.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/54832280024.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/57613682467.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eb02266a061792c4d41301ed12d276f6/30872597180.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733b8ed5d4c---52800856892.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/poziwolu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c06baf22dfa---82971595129.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/lenedeni.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/40476409308.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/81ba4981664e9677f594b1b00c59dd07/38390261411.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6916b4d3---xebofadubobowekoko.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/daxonugabegopevu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608788b5037cd---jawapojuxanebolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=eso+time+in+doomcrags+shadowPDF 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_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15075 17436 bytes
SHA-256: 6c60fc66a371f1e744d5f7ac38706312a07ff8c3bd748b67e558d7ea645f8360
font_02_sfnt_off00017dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD2 10840 bytes
SHA-256: 5ff27b000eab166686fd2c62c2aeaf1b1e4e759b22906968376d9cb223d79712

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