Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5330bd78b947bde…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 00:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90499c130a864660ff6c376cb2731430 SHA-1: c458b58146565c870822a8d27a0a4ecc9be36525 SHA-256: d5330bd78b947bdee3f897ee5bc669c7c74e4a1898455991d10708ef233d854e
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The presence of multiple distinct hosts and the nature of the URLs suggest a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9c8dc89c6169f7fc4def24197f60670d/13906362876.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1e2a1c61---17468922283.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/texuso.pdfIn PDF document text
    • http://jsdarvin.com/files/56987064600.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d33d04b6---34159402523.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/53473123306.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/savamatofilibulava.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ba8ba6ca66d1f7f0741b27fd0950e6a6/raparuxorikedisunodineli.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a0b79e92cf9308b65318a6a61b73a0a2/18386084129.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/43098240270.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942100601e8---terufenudamerijepefujomow.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d382b423fad---19353264782.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/073170bc412107e7379d266979c58cbe/77705914803.pdfIn PDF document text
    • https://majubesar.org/contents//files/76177829834.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7812a0933---nesejibupenaputixudi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69a697f52---xunimar.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/meguzezibit.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede640ac29---josaxe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/924ca3531225ad99e459e456b2392a6e/xudifafalogolawetafujezez.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/rijofobatiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hello+world+in+haskellPDF 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 10416 bytes
SHA-256: 2fe4c184162d7b0d1cde9aaa52c6888c0e8c2aa5b11e978157176a7875d1aec7
font_01_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 24132 bytes
SHA-256: 43bbdee23c56f1dca07503f899ffe8c9c3be474668ed5cb349b6f80cf261fc7f

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