Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1a70b64f1f8d4f…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 15:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4a144a872a6daaaeab4afe584aa2b40 SHA-1: 0926a7a57d9be1cb33f1ab902102474d0b091c72 SHA-256: ae1a70b64f1f8d4f184ca1107e60b63885fcc25fedb583bbe91fc6f23a0c9d0e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript and the link farm structure suggest the PDF is designed to redirect users to malicious content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 https://archism.ru/uplcv?utm_term=created+to+be+his+help+meet+read+online PDF link annotation
    • http://matchedtubes.de/userfiles/file/wupol.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/59453579419.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/bevasigaxo.pdfIn PDF document text
    • http://rcot.by/pics/files/mewamapufekisusi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161490499d3f67---vanisimirinadawezupazebul.pdfIn PDF document text
    • http://ned.ru/uploads/files/88064656357.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109072131305576.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614db87308e11---56412451535.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zifefegepijokosub.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d1edfc6e1447a274785b89184043d290/81052768652.pdfIn PDF document text
    • https://citytrafik.nu/images/file/geweloxelifijezavogo.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/vunofusokukavibugabafurez.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/xekelovifilukuzipepe.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/vutorevilukofawaxepesar.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/13027694364.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lanevotufewipafugabiwib.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/222495558e69bfaf43b386b264bcf1ae/vusavebo.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/potozegofopuri.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210924011833_krdgcc.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wafamupoxup.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/baratur.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/wukopozoxerowadogolegivit.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dojegojebalufajuminaxak.pdfIn PDF document text
    • 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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 16948 bytes
SHA-256: 06bad16f1e6039abe95214703f1aa080e39fdc9b405848e79068ff8cb4ceddf9
font_01_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 10828 bytes
SHA-256: 34b60f23f0ef468d975a668540ed6e9bbc8b4e7471b8e20fd1ed9034d839eb78

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