Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a1ada0a88cf97f…

MALICIOUS

PDF

87.2 KB Created: 2021-08-10 11:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2f20ae2fa018e560ad165ac9ba84b63 SHA-1: 49e0dc25e2bb99ff903d401f4295902c7ff41016 SHA-256: 98a1ada0a88cf97f64f205588750ec4b28a7fa4af3e2d7b1b07abea7b297e094
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm serves as a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6km8ovs2mpmbrlggtrbit0gkb3/jamiwalupubawuse.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec72d36b6---90545935827.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/39919221386.pdf
    • http://silesiacapital.eu/data/file/11108837942.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607d031fe62df---88278379877.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d6323e9aa89c6e6d79a58a0e7d1d8feb/zosatavakuroxerunafilu.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608150bd49605---korabogopolotafunef.pdf
    • http://churchtextile.com/userfiles/file/dexuxexetoxulajiwet.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609feccf87207---bikeka.pdf
    • https://hrmconsulting.biz/upload/files/81463792752.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/431e35550b0b9e4ee8e4260c45bde711/kapopekesexavufa.pdf
    • http://minerva-collection.net/files/files/vilofoxazaxejogaso.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/98190098842.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/99886654189.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/vevipe.pdf
    • http://mackyz7automotive.com/js/upload/files/kezuzizugek.pdf
    • http://standardamulet.com/files/files/46686394268.pdf
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3aac3fbbc---funopamamubeseje.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85298862436.pdf
    • https://equinox-e.com/upload/files/19467689285.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc08ac5b1e---kedumepolotul.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/983aae6b4ac21971bab9f76198183d91/majazogutobofagazu.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/1926287115.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca019bb5aa---bositotixawadox.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ed581b776f08e369611bfb4d53685e1/61353365751.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=10.s%C4%B1n%C4%B1f+co%C4%9Frafya+kazan%C4%B1m+testleri+indir
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15d.bin
48a9efe9268de600007290186dffc663209e0377e2fdbb250b5bee20a4602008
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 18184 bytes
font_01_sfnt_off0000ec04.bin
b222f6aeeb58b1244d256e78e7debd238f15462acb644d2dfd065cbf77307cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 18200 bytes
font_02_sfnt_off00011884.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
font_03_sfnt_off0001309b.bin
10572444665d42e3ff843b486ae9cfbc5eaae3851e1055dbc532330e074f951b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 11324 bytes