Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b61532e5b6bb06f…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 22:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 55aaa7412748a48b85a26c8a9f0d2cdc SHA-1: c98f4f4793510327eebe48aaac1bbe7fdfdcf461 SHA-256: 0b61532e5b6bb06f6d27be45ad446a449de7631b97e9978430d064484e84cfee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://netshopnepal.com/userfiles/file/wobafiw.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6j5shdpebdjs1bkcdjlooc5jj2/90095859493.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8595e52c---saniziroz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/t9ugf0iom6u6vep7ui698i0bv0/wimuziw.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/30060926276.pdfIn PDF document text
    • http://www.heksan.com.pl/file/31396796767.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9ff9jjreusecfqtkapicpp9f9m/sukanilobukev.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/028b48c93d234219b85355fad63f7de9/76872178507.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa775f4d---35524403518.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/67191700387.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/ropuxujutujoruxunakeze.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zutovagi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086862bb13f3---robibefureguxoxil.pdfIn PDF document text
    • http://bichvan.vn/upload/files/puvijezidabojatov.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3deaae844eb113c258d915704565b355/misedul.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a8576bb---jepifulurolag.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30f8806d93445f8221739190c12910c9/98530638865.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8b3ed800ae9363a6e46590d68707c8ed/madovugoketugogi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/coqetl4skua4nlk21das696ntn/mixoxejirudapejoran.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120cf66016---575632438.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/sudokurewolewazuluzu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608064eb26407---91744667604.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c401101f9---79054715126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=master+for+minecraftPDF 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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 10444 bytes
SHA-256: 3ebc2c290949ff923c5da789e0e3dbbfde5c1b0188c050aab6ee303c99f68db6
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 16720 bytes
SHA-256: 779b3bf2f5fc3b20af3812a28d8ebfd9c18d6a2f61d58a24d39ca6bb314788cf
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1