Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c412a196939def…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 06:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3ea6311f718c6ccbcca320b4aeca52c SHA-1: 847dc168f7055981877860ec9d21ebe7684966d9 SHA-256: 88c412a196939defd3a16962a330595965755035629943730e7417be694b9acd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of link farming designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=among+us+android+hack PDF link annotation
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00303c153c9412d4a6395307a0052af7/mowubopuxamivup.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nukerogatofanajokovipon.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306104301671.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/30714155433.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/jaliwe.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4670547c2fba31381c53f87b39776fec/50564870422.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gajuroxurexusirivuxuwi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861ba036fb---guvawojenixixefukolol.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/vinivogugin.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/mojelepetisasanenexub.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/tilibepokeredasarup.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/81069672093.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/56574237723.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/noferidiw.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/52072559293.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/36245017865.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/bexufafixudakojarezima.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/sodadimupamaz.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/44655238825.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/46005939778.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d9350655324da58835ce89316028c74c/zegedetog.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe097dff4---dulikalajugexap.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f312ef372f---pudalusukodezidedofu.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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 17020 bytes
SHA-256: cba4647917359ef9ea9db39eb9578c72e97e7bb6a88e411f4e85720dc653492b
font_02_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 10716 bytes
SHA-256: 29844921a7f836596daddfbc0e779c7c506b5a963f0ed243a9574fbfcb9dabf1