Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9b844bbd6cd42…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 14:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d19f8cf10373a741c081b4c41fc015 SHA-1: 6da3a0c43db51df0ec64c232ce104680914281da SHA-256: 50b9b844bbd6cd423fcc60b7dd817da30e5e4c5539c57e3d4e7d67a2f512e68a
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary attack pattern involves tricking users into clicking these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rendiamovisibiliglinvisibili.org/file/92190818872.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a664f279c8f---58963992931.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc32d2045---zoxirajalugenepukuwe.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/xividimozuwetakor.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/1be7858dda078ef94f8dbdf1fdcaab16/lopapoxesomilutajugegogin.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e16b49e02---xerebevajolosiwu.pdf
    • https://cafesca.org/ckfinder/userfiles/files/35359565731.pdf
    • http://yves-segers.be/userfiles/files/pebujakuvulevizetip.pdf
    • https://joebalogh.ro/imagini_ws/julubonolilev.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/704e35b03013cffd858493283bb6cbf3/woxuzafizopukitojigudixod.pdf
    • http://better-pharma.com/images/file/files/lulibuzudesixonezenexazu.pdf
    • https://dichocungtoi.com/userfiles/file/9158237527.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1e6l7ode1m64g3c3a6rlbvvtld/kekopunab.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a673e1465c52eaf300adb56944408a51/62139549702.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vr31tgd98pvhj0ajca5apodasu/paverabanudika.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da5f76e1a---sipokovexemufefidesop.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a142bc5cbdf---kukepogerugumotanalipiv.pdf
    • http://hopkinshigh1988.com/clients/75739/File/82181785087.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317735abe8---70913318608.pdf
    • http://phamtrangia.com/upload/files/19046256932.pdf
    • http://b-solutions.net/userfiles/file/zeferewariliz.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b056ea7421---gugekow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=npa+of+different+banks
    • 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_off000100b1.bin
28b5e9df28465723edc6b8b72017cdf60b32df33a653cc139d278419bd628c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10656 bytes
font_01_sfnt_off00011908.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 16792 bytes
font_02_sfnt_off0001311a.bin
d79a7fb7b718f0b9aeb8e1a3b8a922b4445499edfe90400858429bf4d4610b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 17212 bytes