Malicious PDF — malware analysis report

Static analysis result for SHA-256 27631bcc222241a1…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 09:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 309f6b3936c1370fb8e75da500166d3e SHA-1: a332230e0a91b84affb45b543de41eebef45da42 SHA-256: 27631bcc222241a1c97347eaa53d3974ce51a72d3b48d73e6e9c70a01fa3220b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is an advance-fee scam lure. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the document structure and URL patterns are strongly indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ckmusicdesign.nluserfiles/file/72768734483.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee36ac5af4---9587385580.pdf
    • http://princeverma.in/uploads/files/musuramor.pdf
    • https://areicon.com/images/file/gufazubalokefo.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d6004867e1d55c43b0d3695de92e4b5e/75828861539.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/819cd3930330dbeb91110e66164821f6/dewelas.pdf
    • http://kwong-cheong.com/userfiles/35753719350.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/207001849460a7a54f29a79.pdf
    • http://dush-kz.ru/uploads/fck/file/sodijividubibiwotegifujiw.pdf
    • https://777mto.com/contents//files/92586594876.pdf
    • http://www.odnpoznan.pl/fotki/file/file/munezuxolaxu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ddbc635b056a9d68181d4f24a5b30ec8/kumexiruvejukujoxezofivi.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0d384b8d---jofasetinumakuvepam.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/3786528690.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/99b2bppvc72mchbuo5ur4e5e10/91795267392.pdf
    • https://ludifrance.fr/userfiles/file/47952603348.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106150150233492.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/64602146c0d06760b931977233b677f0/remobarudijofevoxirewu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b0de2c4f---xelamosevetes.pdf
    • https://wineart.online/userfiles/file/zufibupanekeka.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/heipltli99vnunhfrscr8msd87/81036994050.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a699eba32---sosobonopevaju.pdf
    • http://shinex-auto.com/userfiles/file/2066942890.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1qr3h877lumvbh39fjiuhp7f6/zudajamawulujume.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9898431a0f919558125b93a559f71693/lubevexeponuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=generic+structure+of+text
    • 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_off0000e8bb.bin
9dce58f76a85f48d58b1fb832c6811b08dd1f14ba96678df2c50f8501d44a3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10364 bytes
font_01_sfnt_off0001005a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes
font_02_sfnt_off0001186c.bin
e9fcee72cf1990ff9e52a41cd1ad757c074810323b1323b7f1ea979810f9ffc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 17132 bytes