Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f315266049990a6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 18:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c99ad066a0ac354f6c41deebc39bb187 SHA-1: 089ff3f8f654ae2aea0ca539692f5aad0249dd54 SHA-256: 4f315266049990a61c57dd0c8cf89a2edaba6d47f4cb43dfeb485cc14bc7e0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kulefiz.pdf In PDF document text
    • http://rainbowcaterers.in/userfiles/file/12883556419.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/j4dsma7r9b1rd09u3ho4g100c3/virisubuv.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/jenevamimixemimekamitipu.pdfIn PDF document text
    • http://bscartridge.com/pic/tugujiga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a68860f3dc81f78d7ca00e253a74cb37/70379948587.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608153e965b25---73103417642.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/mapurarufu.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/39185311714.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f4be1145cb5---50067984218.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pusajoxelopunuwivu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/18800740476.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/64885295150.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609982064bceb---61487248185.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e623273f8f1---nejuluvetekuv.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6d8222c1aa138cde6d0fcf45c560bf68/xomibesidoragobes.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/wixabumamorovuzobinejo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gokigafazaluzoxuliwelalum.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768d06a57d---52164100857.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/zezesoluf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0597e742d---3701453072.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/80d9bdb6d67c29574222e6b4c99762f7/fizexujurewijediguvug.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5a456rqv3e8kumapdi392dt0c4/85734175289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clinical+psychopharmacology+made+ridiculously+simple+8th+edition+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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 11520 bytes
SHA-256: 77f9602e6ceee7fa878b33b5d38b8b033999162c258d73a7d6f5c9df51325ed2
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 18216 bytes
SHA-256: 41cad34c945c887b2ee7722476ee4dd2928dc63b1ce376577f775553e32453c8
font_02_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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