Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e1fc8bda327be2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff54a47624aef23c0e1af1998c62e4fa SHA-1: cd0a96f15e1b7d34977380ffc549050ebcd6d268 SHA-256: a1e1fc8bda327be201fcdd198ca3ad2801b4265bc3f1b7c018545f1be63b1da7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security and deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=wwe2k20+ppsspp+iso+file+download PDF link annotation
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bisumuxilarivoxolet.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pasoridazizeruzejuzofuf.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/vofaziwatutawanaraxe.pdfIn PDF document text
    • http://sieuthibds.net/images/files/91791516014.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/26960543043.pdfIn PDF document text
    • http://punaide.com/userfiles/files/24719541223.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/dapodobepemekokevokexigex.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c760db7722---fujade.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b4ee7704---46189632958.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/85787809198.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/gasefi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/4692712267.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/zebegaligozo.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/sujowejixuwotekagenebijan.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/28473791202.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/fugobidademavutado.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/dopez.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/75756368035.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/bofudademepigasapiku.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/wenuwewejufida.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/27256240075.pdfIn PDF document text
    • https://blokhol.com/upload/files/33160699720.pdfIn PDF document text
    • http://halmar.info/userfiles/file/vesim.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433e8db57eb---saduzaditemobazab.pdfIn PDF document text
    • http://shatalarab-llc.net/userfiles/files/xitulojofozetakij.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/49541243480.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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17352 bytes
SHA-256: 50b76efc0db2e2efa031f2e7de3cf4165fbcf339edf356317f944e4000e44ee3
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 10704 bytes
SHA-256: 5d1222bd5a757cea20d903cccddfcac63bd9d8dac52661549b99aa1280598738

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