Malicious PDF — malware analysis report

Static analysis result for SHA-256 86832fbd51866038…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 21:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65b8637c871be82b8fa39172254930f8 SHA-1: 6d1f2cc1c4fd062f02a6039f3d685be6e64dc501 SHA-256: 86832fbd51866038715fadfe84fdd97b0cb4ebfbb1c77a81f2f263d644a19b9b
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a link farm pointing to multiple domains, including a compromised WordPress upload storage, indicating an attempt to redirect users to malicious content. The presence of a QR code lure further supports a phishing or social engineering attack vector.

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
  • 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 https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/21016941827.pdf In PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/levaku.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zalidalumiluw.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/vowujiwenox.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/81861399744.pdfIn PDF document text
    • http://taociren.com/upload/file/210915121731703127uobsgiidrert.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/34332102125.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8562454644186d6ea0c11636e05757de/wuzajizuxovesisakotowedi.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xetakoganowafejufi.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zezurizutixexesat.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/pinenulekadonunovi.pdfIn PDF document text
    • https://mkontroll.hu/File/52700748430.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jokezovubabidujisu.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/vivokelufax.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49982916671.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/fawuvakanijisafipatij.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/13728312726.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/siviziw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/50bf60253bfa1206823e31cda160129f/77326218942.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22485874f---kezubavamafonogalan.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/c1l7j8iosms0vp5nsi36kdgi5b/bekizi.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dojosodevetaturebu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/sixepanamotelozifam.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4c0csuf1iduefut6lrteru9ul4/64854271872.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/susazejenuzunuzomotumam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=heaven+pegasus+beyblade+qr+codePDF 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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 17744 bytes
SHA-256: 33864bc32145cd85eca9da62bbb685db6b7d40a91e57df781f395451160525f0
font_01_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 11056 bytes
SHA-256: 42ffcbce9c675345d92a5dbe933ebd73c27298dd17cb099a279165b8702008f1