Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e61ff7d4c49b4b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 07:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 657f7b6414c5db703e70c39aca5dccf3 SHA-1: 2eac8f98d519f97769eb8ab888d2ad1f6ae4f63f SHA-256: 64e61ff7d4c49b4bf376907c7a81d174ca0304ee2f96a8c7bcc1e1a9e19a9515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://bike-aholic.com/UserFiles/file/64853455663.pdf
    • http://kamnitikamini.si/upload/files/vatuzepevatetatowulofigu.pdf
    • http://usmleworkout.com/files/file/21592747411.pdf
    • http://karpatskiles.ru/store/file/12447150153.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161490450b2b22---fomevejowakazusufoxofeb.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/fusugurorotidowoji.pdf
    • http://ride.hu/images/uploads/files/95761655827.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/59984737363.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614825c35c9d0---mibupat.pdf
    • http://studiopassarotti.it/userfiles/files/76606452727.pdf
    • http://bpabv.nl/uploadfiles/file/maladuzudaxopepuge.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/7577800429.pdf
    • http://phutungvespaco.com/luutru/files/banoxodufujogid.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1ae591bf65c4644499f32b8d807a1830/47977104533.pdf
    • http://tcgardening.com/userfiles/file/2021091411043573499.pdf
    • http://trubaopt.ru/content/file/debexe.pdf
    • http://goksirlambinowice.pl/img/upload/files/13237526590.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/kolepixojomevozejekatumu.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/soranadivabuw.pdf
    • http://netichikawaya.com/userfiles/file/70560616552.pdf
    • https://myparrotfood.com/user_files/files/favobopuwowebubiwubek.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/28336041533.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/46213548998.pdf
    • http://www.pvvc.cz/files/3496711678.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/thtncmkkf3qi91ld1sra0d0ods/jijapugifexogekeraf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+tamil+tv+shows+online+free+streaming
    • 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_off0000b40b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB40B 16792 bytes
font_01_sfnt_off0000cc1d.bin
3522c04822ae849abcdb3e721071c5570055b5b2520f10e91a65c904ad80b947
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 15272 bytes
font_02_sfnt_off0000f27b.bin
0dcb10c3965f9af4cde9a5f740658c7b8d62c98d91a8606ee3301ea8573b6118
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10928 bytes