Malicious PDF — malware analysis report

Static analysis result for SHA-256 7528a152448e95dd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3e74926f48a97513c11b5694036d7ef SHA-1: 22988c081cecc40f1fba6a24121bc0a92dbdddff SHA-256: 7528a152448e95dd85cd695fb92f069a3f18be4a383aeb16d042dd696664c3b8
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan delivery. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, designed to trick users into downloading further malicious content. The presence of a 'download button' lure and external URI firings strongly suggest a phishing campaign aimed at distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=control+one+android+device+from+another PDF link annotation
    • http://flooroverstock.com/admin/userfiles/file/wazufujizusozevas.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///joboregazeje.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/puravanejexodu.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xaburoveledadegem.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/develodujapazugetafop.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nebamewutufavasajadif.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/28597109604.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/404362361.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/8130149931.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/90320661285.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43179436245.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/netipafusoxulafu.pdfIn PDF document text
    • http://dhf-china.com/d/files/xalajebuselivun.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b80f3d2c42db1102046e39dfdfd12ccc/nivavonugejexonokozopibax.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/62680502615.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/k16jkaes09tp8ts5oaqoqopunb/56737748936.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142afe77ed88---girufuji.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/79131328119.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630508177463.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wateram.pdfIn PDF document text
    • https://mashura.co/userfiles/files/38934080407.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 17668 bytes
SHA-256: 981611379596f8a03ba9061d725376e96d0752a45b612553653c71caa28e55a5
font_01_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 10668 bytes
SHA-256: 035bd2540fa4d7ec01e398a952a2352a3821a86f19c077572baeff25dc66873f

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