Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31090e8eafcd636…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 02:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 35a5d42e1d95d4229cbeb20699714b1e SHA-1: 1b17b8d207c45d32a8915a43d10e3f8e621bd984 SHA-256: d31090e8eafcd6363d3d88e4750b18a145323c34ed305f407138141e61df614f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many hosted on domains identified as disposable or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary function appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=tmh+general+science+book+pdf PDF link annotation
    • http://furniture83.com/upload/files/37584996466.pdfIn PDF document text
    • https://x-software.cz/data/file/10027055272.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nuxewupatajo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/82584623746.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/kevawelodavijavobanodire.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d6c1bffb---jewobinamadapukekipudozo.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/wekopoxozexekosetulavix.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/69f2a8349788242018a1095ef2f6d95b/28531395892.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/soxekurivibatuninijafenas.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/562316469.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/savulelutozesogojus.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/favesiwiwapezosaso.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/widigusaposebitixuletefem.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/lezugojorazovikekega.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bokusuxifob.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/pixeredadigof.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3c44205af88b1447aab3282b993fe0a/54586814179.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/80236390005.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/toguzozadojage.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/93460908346.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e11737e3---598392945.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210826_4D5B4330EED6067B.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/juzib.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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 11164 bytes
SHA-256: 3cb19fa52c49502d0fde87e13bdb6ef16e93d963bd4cdada2243c2e5169205a5
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 18076 bytes
SHA-256: 43a3894dba03c05d5e1511169bc68ecd17357a01a57db0c0f67041d5d3de0560

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