Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced7dcfa14b14a43…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 21:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec0dda739423a7b8fc0d466174ff7f41 SHA-1: 1ccf817c6bc55430feef7d9450d803004b8ff16e SHA-256: ced7dcfa14b14a431105f55332b9bc86fec74aeb82ec1839f34f22c6bf83c939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coretry.ru/uplcv?utm_term=auto+answer+call+apk PDF link annotation
    • https://beautydent.hu/editor_up/masewetatajo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tedifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b3253dc---fegig.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13412822478.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d824002f766a098f093cdca77cf47982/fusolekexumonelozukiwaw.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/rumukovilewazobonefama.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rss6gt18c8b0nruoht41pcg44g/15984726667.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zusexekagodusuw.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vasavidopazowofexulizun.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/44432379470.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/zetopo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/47455276803.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/34714703482.pdfIn PDF document text
    • http://bienbao.net/uploads/files/39819672951.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zikanifenigetadevav.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/mijoruniwutaxudoloko.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/36326041061370fee3808c.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/89395563590.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/93871142791.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/pitasobujufewew.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/57984640189.pdfIn PDF document text
    • https://unosms.us/userfiles/file/80501517949.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zodamaju.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/86923232831.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/jimutasadupuvodazex.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10536 bytes
SHA-256: e1351525b3e7c4d6882e45afdc3b6eee7cacb48671af01ac14163101cf9d48c4
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 19860 bytes
SHA-256: aaa53df5fc4b94a18824f3338d7705439e424e0e6d11100b2a22991be88de5d3