Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87fa0024d72648b…

MALICIOUS

PDF

96.9 KB Created: 2021-06-29 00:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd6c0f53370dcea927a6cbf3fc684abc SHA-1: 1ea983b14e36826430afc9411c74184e1a129f94 SHA-256: e87fa0024d72648b3132ccf74642abfb8acb808fcb6045f8e7eb106189d13c2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=d%26d+5e+out+of+the+abyss+pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0821685d4---mazikosi.pdf
    • http://kledingindex.nl/images/uploads/serusagasoganavadudaga.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/7118593442.pdf
    • https://vicotelecom.vn/static/source/images/file/7666869151.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e46d8ba2---mekosimegutode.pdf
    • http://c2ctrading.org/cms_upload/files/67240957105.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ee24bba6---febiwolosegowilewa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93bd55b7---8967068384.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a846559dfa8---61656458892.pdf
    • http://schmetterlingsgaerten.de/file/fowetutokotesonu.pdf
    • http://mwflower.com/upimagesfile///62040355807.pdf
    • http://brandnewgoods.net/userfiles/file/56094201063.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160939f7695419---riguju.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2d6a4138e---94596082058.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cd3b852f71c8061450d78d0fda611a98/30089521987.pdf
    • http://hitecds.com/userfiles/file/73510712965.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/844c5e858845c40723cd8e49dab74e0f/nolipuvi.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b054c21430bd93d3011ef7c48bd542a/jadimonagezujoxo.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8bde945e---51570782160.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3a200ba2---pexomegaw.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d6414cd6---69129993646.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71850338530.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/09a8e025f4acafa9bdb538a25d6807aa/60817323406.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/gegipurodejug.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2bf270914c5fdab1d994f86510698a5f/44564685119.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_off00011d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
font_01_sfnt_off00013544.bin
fc45a7e381f78ec682be5fa8724bf33e4597d859cdd277401f32b75c434cd4cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 17660 bytes
font_02_sfnt_off000163f5.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x163F5 9076 bytes