Malicious PDF — malware analysis report

Static analysis result for SHA-256 5083a51f7bff042a…

MALICIOUS

PDF

98.3 KB Created: 2021-09-07 10:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3db6802edab27e2a3a9151253a5fbdd6 SHA-1: ece890f241df3fbd8e6eeabcd4604805a7f0f308 SHA-256: 5083a51f7bff042a7abd97512626a2fc77ae9bdd5122e754e3f8b334631f9276
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI firings supports its classification as a malicious document. No scripts were extracted from this sample, but the overall structure suggests it is used to distribute traffic to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=optical+properties+of+photonic+crystals+pdf PDF link annotation
    • https://kmkmekanik.com/upload/ckfinder/files/89468402905.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/59967386731.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e4465af111b1d77c55f49cf4307f1870/bexalulowunapit.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b503218d---povamajiparolekijifod.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/98033550924.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/bakepukuwilemibofanadipa.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/zejerojomunepejiwobuw.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e51d02e48---tekuvimefevatu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/41cc9416e49914caafa19b1a85505c1a/33890758862.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/61809948441.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xawabazakatepofeka.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/melutepadav.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xolijunuzideruba.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749105d839b---23906641681.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/93856576247.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/belenozunigulatemo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/74565767040.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/fojakax.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/2259983649.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda93acefc4---95498964714.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/desoduzi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf05d2d5fb---18965821764.pdfIn PDF document text
    • 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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 19232 bytes
SHA-256: a9dbd822423571177d55765ad6a0ce977d5dd27a950bb153564aade736c1290c
font_01_sfnt_off00014a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16251 10856 bytes
SHA-256: 34beaf2df81b8d12fb819789463b32ee32a9455f922781a404a9c816786c9c93

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