Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68aada92f496ed1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 16:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41d6d83d9b6344979320c875d7d83807 SHA-1: d808ee3869d25de6340e9714dcb127b7d6cc56bc SHA-256: e68aada92f496ed1fb6137b8a1ac6c68be42cf0c02458457516c63bd50772c36
164 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm designed to lead users to download files from compromised websites. The primary URL, 'https://chcial.ru/uplcv?utm_term=swordigo+mod+apk+unlimited+health+and+money', suggests a lure for a game mod, which is a common tactic for distributing malware. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=swordigo+mod+apk+unlimited+health+and+money PDF link annotation
    • http://nanouklid.cz/upload/file/xuzuzam.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/lixidofulumu.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/dovetevipobi.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/zemopipekinatoxuleb.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/batalupebibefiwojiv.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/18932686059.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/33773711178.pdfIn PDF document text
    • http://koala-al.com/d/files/44065550533.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabesanatok.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tejajajowon.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/tepagu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4838d5d6e4de60ad1808e26c1e34b44e/dawebagajizasu.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/sukogeduberuvim.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05c463e56---vinarovikugasutujuferurop.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7599ad6b8---39711737392.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/32849042532.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/6034099094.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/ganelebotilejedisefijez.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/87310322545.pdfIn PDF document text
    • https://songhongresort.com/img/files/nitotorakitepazaxipelow.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/88384538873.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/75806485826.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/26459490455.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedogewikutowe.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 11140 bytes
SHA-256: 5c2d87905918df1b048e6c1ddc2903e116753caa5ff55601be505c172848bd89
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 17252 bytes
SHA-256: 1902082b93f75e8e8ea7d8c986a39cb3ef785e76cf00ac52c779199eaade4d8f

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