Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e63d7f4c6c89f80…

MALICIOUS

PDF

69.3 KB Created: 2021-07-04 00:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a1edcb9ba920fe2b4f648083d69e3e00 SHA-1: da93cbc230122bce69cd2d984b6ee278e9829598 SHA-256: 3e63d7f4c6c89f801e46ec850cc5f10393fdc2a3a2923dde9096ea1cdca88af0
116 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of IP literal and link farm heuristics further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://runningrhinelanderrabbitry.com/clients/875187/File/xapimevekodokafelaloj.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44de34bb74958343a3866b6cd5ed99db/42641105071.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f6tef21mobhm4o8tcjc3sbjm9r/nadajuzedaketunogodojede.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/dedaluxuwakibogowiseso.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc471b81c9f---xagenowavaluxam.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/80005638546.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/5985980785.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/88192293760.pdfPDF link annotation
    • https://tenekedjieva.com/uploads/file/josuzazijabewapijirugovi.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/11518987922.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b709747fab---66329594659.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e17132c9---1484733954.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecc93a3a8c---95826085775.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47371520018.pdfIn PDF document text
    • https://wineart.online/userfiles/file/dobosejubulogawuvezetilik.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/jimovusazel.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/48c9293e2b92bb0127366c288103ec7b/tulomomopejemek.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ujtae44fd1t0c59d0invvi4vf4/64367758562.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e26b622e5831a88353d83d4eec742a54/sodabab.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/zarexirewiduruzuges.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/88268499358.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/vovovivofufox.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb74f22b---35548964123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=they+were+seatedPDF 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_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 10148 bytes
SHA-256: eb93d3e55b01f256dd5b71a84ecbe665f860f48b42d7cf5257b3e9b83ae7db23
font_01_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 14312 bytes
SHA-256: 6a0f65487e39de440e41ea30c036623007d3444c4ec2de2daaa62421c931c711