Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4af4300700e6473…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 04:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 591fe3066a7ef4f5b0855d3a86014464 SHA-1: 8875dd6e7c4bcf44b2ad6bc9da61693af923a982 SHA-256: e4af4300700e64738136439ba318473766a1e27e423155586c540aac35839ef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+to+hack+fb+account PDF link annotation
    • http://mc-opony.pl/files/file/77287740795.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/safapibuvijetowadi.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gebilukadiripibulalujudu.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/nevofomativisabewezagojof.pdfIn PDF document text
    • http://remobudostol.pl/pliki/ginejofakiw.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/22463135585.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/rilako.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/85367022808.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/votevedenapavezidos.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/1983453421.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/1959845510.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782c29a85c---vilusumemudo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/luwakekanez.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109121007011017.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/gijomigir.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/gotadogurasirit.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jezatadosozijozizenodo.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/sikukewokosilud.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/082c861f10e8e9408f7a8a4b4c9fbf44/45498373106.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/dazopakesoxavomedoruv.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/83292244731.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/20216537620.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/19215276169.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/43082928321.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034ed19738---napovofowobokosidulone.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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 19408 bytes
SHA-256: 800732f3f3613e6ce1eb1a9364e16f185907234533b4132ac6573df1525f5644
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 10304 bytes
SHA-256: 60be8ac531e1976b9810480167726c96d3811e2fe32c9bbe728889e30507ffec

Open this report in the interactive analyzer, or submit your own file for analysis.