Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d0ea6b8166dafb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 19:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f9b5957222bd01dcceaede9e4987e58 SHA-1: f78666d64bcd0f051adee17cc3690238a7c225b3 SHA-256: 05d0ea6b8166dafb15841ef3e4cd2f8e4e12a979abf5daea989025c3adabf324
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as link farms or hosted on potentially compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ecohort.com/userfiles/files/30740833009.pdf In PDF document text
    • http://davobio.com/upload/files/60720296219.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/liruxan.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/95424297825.pdfIn PDF document text
    • http://cx-gl.hu/images/files/66848784034.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/merigofapofuper.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62181874581.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/96358158382.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3de73451---fojufajimavakoxim.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/30270058601.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/zinufuwidosujodas.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/68355454686.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d2be90802fb624115a72bd32577787d/3279853037.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/dobakebebika.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/pisapi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613597ff32dc3---girabutusuxajalasiromuwen.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/2389191261.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wovimebiwo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/topudajukekoxufasidilover.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901133444.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/53136075223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=remove+pages+from+pdf+mac+osPDF 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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 17720 bytes
SHA-256: dee0563595bda3c87200b7d57d854382881e6385bc896456a0decf219d970622
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 10732 bytes
SHA-256: ab35a7ce03df669badaf62247f172616c7e4c59cd666cc0a91f0ec76c9af690c