Malicious PDF — malware analysis report

Static analysis result for SHA-256 81289ab10dbef3af…

MALICIOUS

PDF

90.9 KB Created: 2021-07-09 02:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48c4bb9e0ce9c4930350c3b79c6e156a SHA-1: 008c3a59a503188978808b51f13dc54c88e5552f SHA-256: 81289ab10dbef3afa0298cf6159a1723579cc769a1debf1caab5d2a20b1917b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=arby%27s+cherry+turnover+calories
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9afa3f98c566a413a0b75ab20dd2fbe5/nusunalafipemize.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5db16837---78437422137.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ov7pf27s0fvtihp2o0bk24iti2/fotipiw.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/7215644268.pdf
    • http://sva-jeanroze.com/xmedia/file/61783243287.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/41629fec20142c9be14415ad94e9053a/55340960066.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21a2dba82---10328240921.pdf
    • http://technoculture.cz/admin/upload/file/18087387936.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/66580466360.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf16b2bb12---wabojaxariwa.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea3f71fb1---55352248160.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ea6f063ca57fb7c053ce6ab717e7d514/92981303136.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab51e4b33c---gerozogaba.pdf
    • https://aspaeng.com/files/image/files/zodisoxuragesibexuzupa.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4llfue5shumnqd5d37dlkp03qo/11563920283.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/sijoje.pdf
    • https://kfmaccounting.com/webroot/img/content/files/finojo.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64702b033e---88285021240.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0a7070ee---82798622063.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qv5d7mj7e7gich86u0j24ilc6r/pisidepojopufekobozegusur.pdf
    • http://gemculture.com/userfiles/file/16789609407.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d5b5c65cb---83861143615.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2d44495d5d60e452e94c8dbd31b3ad58/76089899338.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4fa2d336---51558324843.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c943a13f306---44125520853.pdf
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/48500209252.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe44.bin
620fa86e407feeb3c40b8258ce179df5f428e81e151730850e97dfb18f859eae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10760 bytes
font_01_sfnt_off00011718.bin
7a8bb4da1f4d9db5365cd87a359109dd87aa18aec0dfae6795a69da14de471ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 17740 bytes
font_02_sfnt_off000145fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145FD 16792 bytes