Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0cf1cde83de90c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 09:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b65e114ec0a95f1e87164ca45ac6865 SHA-1: d703a94e316de48f076d83acbc65447efcf40e3f SHA-256: dc0cf1cde83de90c9014ae93ba949081f026f81963a264a7d9520e004b654e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the presence of external URIs and the link farm nature of the document strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=blade+%26+wings+mod+apk PDF link annotation
    • https://unaizahic.com/Files/files/65500589740.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51607762243.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xulazowoledubeten.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/90250456074.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/97439632933.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pafuputibajisesel.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/naxupofatatidoxetoke.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631881133.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161391d4879c13---84121852177.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/67883661569.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ab2c0e916ffdf4701ea316741f3e409a/32272178103.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f9ac7ca---91092384271.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614567ddc4dd9---xarirufujonatozogafekugag.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/vovatetexiradofa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d06432778---debuvikerokogadazomurobe.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///43926347037.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613770edf3384---lolimomawolanuxoz.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/56926558251.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/20479982483.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/rufuvanatewevu.pdfIn PDF document text
    • https://securitydm.net/slicice/file/83617795076.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16308343341504892993.pdfIn PDF document text
    • http://strahyi.ru/images/file/61814030498.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 18268 bytes
SHA-256: 3fac010c6af1ae5797503b13201314022f8158115af79ec6570868d39ef990bc
font_02_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 9608 bytes
SHA-256: 9c653d286716f8184f840d731c1e1a007ca90e393b4b1b7815a1531352361d1d

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