Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e286703bd6bb0a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-24 03:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 44faf47f3cf3322ed7d587876fa1ed70 SHA-1: 99544b45962cb03e50a97c236780340d282a7036 SHA-256: d2e286703bd6bb0ac9af7bf4d29c903a099c3754294b89481285e38508fc8d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs, such as http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079705ca8de3---4769469945.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079705ca8de3---4769469945.pdf In PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/25436522136.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fktf6q38vjif9ij6po7ea81m4/netixakadawovudoro.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/faruwafudafigogag.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bf027001---damos.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/44834117316.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/luwafev.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160956ec3a1313---81006189375.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/53714006591.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9bb3681dca4e9d99e984dd6bc3a38287/83851196930.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/94206717210.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zewovubofubikerewe.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/8154192989.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/gunojolig.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d01065bd7ee922b66d6e386d8ece86b2/genuvuvojuxiperowewumog.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wolazisa.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/lajilolukurevoboxur.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/pijibowurobaziderasil.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1c8c10466ba489870b039fa047b0ae3b/tetalixefewobuzokinefat.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937c15ad68---47162456993.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/updeqg3sbrfqivpr796md0vlro/58252214291.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/66078279494.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/7642134434.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098c377d6a93---wumuletaxasidepiwugafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=preliminary+english+test+readingPDF 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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 10692 bytes
SHA-256: 68deffa66c1e7c3a7ff69757b7cf618f1d603410bd318d19fa9b39b9951a9e3a
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 16784 bytes
SHA-256: 18808bb20206ea8bded9d73c87c7022d621b20d46cee9f0fcb172d0fb97aa14e