Malicious PDF — malware analysis report

Static analysis result for SHA-256 99812f11fea48117…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c75f15e569091527e1adbc2c6596e48 SHA-1: 6181d745da2395d4ba37b98dc7afea239f757b9b SHA-256: 99812f11fea48117873f9e01ab8aeb56a581ce8a338a435e7dfeeb8ee8683f65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various disposable hosting sites and compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://exosushi.com/uploads/files/19378219286.pdf
    • http://planetamama.ru/files/file/kokapeje.pdf
    • https://betsin.org/userfiles/files/77261592616.pdf
    • http://snbedu.com/uploadfile/file///2021090719161191.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/56437534941.pdf
    • http://isvpro.com/custom/files/31009140920.pdf
    • http://autoservizimensi.it/images/fck/file/58248150935.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc9353de8---mulafapopujunavutafeg.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/51022237721.pdf
    • https://granitabrasive.ro/editor_up/31055103060.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3149737c52bb4a8665c4d43298276107/zaviwaduremod.pdf
    • http://kompassztuki.pl/Image/files/72936216359.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ed89f5688f80695d1701435fb464293d/xamudezumulexidat.pdf
    • http://weifong.tw/fckimages/file/jadibulij.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/lisux.pdf
    • https://slotpt2.com/contents/files/bilasir.pdf
    • http://gamax-motor.cz/data/dokumenty/65873438894.pdf
    • http://evola.it/userfiles/files/zojajavorube.pdf
    • http://one9five.com/userfiles/files/gejekubagajokatuxegajup.pdf
    • http://thsport.dk/ckfinder/userfiles/files/zijokasuvufisevubisiniz.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/lemubarazila.pdf
    • http://cesishotel.com/res/wysiwyg/file/duralebu.pdf
    • http://phannhan.vn/files/usersfiles/files/2087933320.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/22487940147.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=html+qr+code+scanner
    • 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_off0000e800.bin
0b8e632e921afe47ec4d77778170ded515a53a10f1603ec98b755240e5e01e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 18304 bytes
font_01_sfnt_off00011831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 16792 bytes
font_02_sfnt_off00013048.bin
57fe4b3a7323085599fba3fbd19cb8bfe4f043a5050a7faa002887929a94f26c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 10576 bytes