Malicious PDF — malware analysis report

Static analysis result for SHA-256 da49b713d5fdd732…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 14:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21f7f3e1ca24dcc3b1e036a40d97a989 SHA-1: 5add9a02185c13925736c9272a363232e3151048 SHA-256: da49b713d5fdd732e9e800b4798f01f95764ea67d776504aa9fdfbace67f239d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd6ce23f1---dosovixip.pdf In PDF document text
    • http://flightshop.jp/images/blog/file/74860304613.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/konufop.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jopokivupinenezo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce14baf4c.pdfIn PDF document text
    • https://pellevah.com/upload/files/gezuzivutubulexuzaniru.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/aa8856825bb0153abc04ccc2a991b2b0/65342443692.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98fbbee25---81504654716.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/97524344203.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dejetosaruf.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/mekosevopodowiwuwuf.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/33633687142.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/bazanib.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/83137586385.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/mesev.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/44258503281.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8183d17d---sagegefusovaluwisuwisi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135537f37c70---pamojesemabuwola.pdfIn PDF document text
    • http://apple888.vn/luutru/files/31295278822.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906230416503.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/suzezenufaxemujelaxulaf.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25339f11b---73323813.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofekufi.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/28791987802.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/mapulika.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/63184057745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shonen+jump+manga+and+comics+apkPDF link annotation
    • 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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 11116 bytes
SHA-256: 637fe9ab68fae20b0182d28dcdef2f786c5b69ed7ea0feb6f9591af678ad1757
font_02_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 20208 bytes
SHA-256: b42a6756a82e39403249455e9c133d1197d8442eac1be8fe62e20185bc8134af