Malicious PDF — malware analysis report

Static analysis result for SHA-256 9744679f17b57d93…

MALICIOUS

PDF

105.5 KB Created: 2021-07-03 20:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45c6b7817c6e82e35d6ae8894a8552d0 SHA-1: 73a26be97c514c5c76801f19043dbd59c6f534b4 SHA-256: 9744679f17b57d936ea3a85b2809bf8e1938044bc92d07085df2f9b43ebf3d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable hosting. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1d941128494ac6af4d8f9c2ca1fe93e3/26300520529.pdf In PDF document text
    • http://kasargod.net/uploads/file/93799733392.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/76260412611.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jusanepijin.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b4289d04aa3fdb3fb91c337b6481d52f/61729382632.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/mapetikolenisovilujut.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160806e689cecb---93973959872.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vamogijideza.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/80685638382.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254d0955b---zojasinaborog.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08869df4---nowinozigogisovozes.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/04fb6addf156afbef940cb7f20e7fa0e/9746606668.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1af30bb0---sujetikipakorajofaradu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b1bfaea9cb4cb6c71343d60da3d801e4.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d4cae7d361a5e9f9101fa926c41dc9e6/pogukuwe.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/mutimiwetesa.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/de303b651323fc7340c67c92e2a7f760/miwafokud.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9316726dd3e82911c2ac0548a773a4d3/80398023616.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/sufukusosavebofiku.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d966ed44---50346404745.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sakelivobukuritagux.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lopugumaxobatozoxudufuwu.pdfIn PDF document text
    • https://stopserv.ru/files/file/78329645062.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0b9aeccaae06e95aa53373dc3eb6c069/wulivufovumigalukotag.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/nitaneruzaw.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7bab739e04fb5b7278412bee66e9a0d6/95420255599.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3dc083fd---1951909330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2nd+book+in+throne+of+glass+seriesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16300 bytes
SHA-256: cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81
font_01_sfnt_off00013823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 17280 bytes
SHA-256: 567047cff9d1d9c9135d3a8d65348c0c8d9276f79a1de6981a19603b3ee21a37
font_02_sfnt_off0001652e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652E 10888 bytes
SHA-256: 9994b8017abe91252e18ad45f720876eefc46566299940c497f9b89f45e8381b
font_03_sfnt_off00017e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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