Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a689969dc84380…

MALICIOUS

PDF

130.2 KB Created: 2021-07-26 02:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d749a32384d49747f2725b9603f1c773 SHA-1: 444efe9b27607dfccf7e95add8cf9debf7e1da96 SHA-256: e8a689969dc8438070d7fa1db6e5d4846bad3b3fddb7aee93aa72120817737d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090014657c7b---18202142973.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/46074491832.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3543788fd45535eb24bd699c344aa717/89624616460.pdfIn PDF document text
    • http://jkohut.pl/file/77668213390.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/bubiruwajasusaferakewenil.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/gajabubofimiluji.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/70682101224.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e5775ae99d694605cd041fa20ae669f9/norezujesutadezowokibagez.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/k3jl24j5l1r19r1jho4jn79lt4/72452778385.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/28197954943.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/65010833777.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7df5d4430---58013520113.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8rod85c4hcbe6rokob1pksrpr5/zogixubomusowujufog.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2rphr8r430gvu5f2u2lqqdjl11/wamuxabasisabiwepu.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/26181883182.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/57879722345.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/42b6e5be3f6e33921f916e7810772e76/93409338791.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/94662503344.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8adcbc1ac820c1255dc70bcf1f89360b/92774458047.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078288e56d24---joxesil.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/65e3e219f83d4a39aa881da4c10d61e2/pitotukefejomi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ivhg32si96nd0tr69s3naqli64/62437309562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=genetics+by+bd+singh+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://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_off00019663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19663 10764 bytes
SHA-256: 4ecafcb8d0637973be20cf2697457afb751dcd091781c9dce832b71c7f719ace
font_01_sfnt_off0001aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6D0 20136 bytes
SHA-256: e6d67767fa3742574d6a0c3df5f1dd661752f3f904eb5da0de49112efbe3a1ef

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