Malicious PDF — malware analysis report

Static analysis result for SHA-256 87487ec11c9929d2…

MALICIOUS

PDF

86.9 KB Created: 2021-09-24 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 473ac5a8c2627d76c3340a5e742597e7 SHA-1: c791343fe78cef6a2699e34d8db95057fa39a99e SHA-256: 87487ec11c9929d242683a37df0e34b0142ec47e85902013c0f950310b6a9bc8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, including compromised WordPress installations and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=video+editor+software+for+pc+free+download+windows+7 PDF link annotation
    • http://avandcie-automation.fr/ckfinder/userfiles/files/fidijam.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/joxaduvuxumewuli.pdfIn PDF document text
    • http://only-svet.ru/upload/files/89149878681.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/99490014977.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/punak.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/bogodomujizibenaf.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kv6n6kmm72486t0seu8371lf88/59083570752.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/69078110335.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/16377528877.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/68834490911.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/47040703877.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/kolonibamawofifisodan.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/fibazixewavabixedezojemox.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/85111042707.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/14910833898.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109020257095395.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0ce0d650---dabetotej.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/lelopakisizadowamalegaf.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/lozoroxepedagufituporevo.pdfIn PDF document text
    • http://zae.me/datafiles/file/gugovowarumazamo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e5a8d4e6---tanawaluxag.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/92404820757.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/60830853546.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/56748259446.pdfIn PDF document text
    • http://packamate.com/userfiles/69406587296.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/memoluliwafux.pdfIn PDF document text
    • 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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17492 bytes
SHA-256: 4d8016832e15617eb2ced16f7ca2c726a77c45685a2e096502d1a973b29120ee
font_01_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10720 bytes
SHA-256: 1de3961828848ab361b2497d5c902bf89944c30efe3b3893066c492adf651fb1
font_02_sfnt_off000134ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1