Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d6d98432cf0922…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63453bec7eee56ed202b19edde09a906 SHA-1: 3db3b0838a9e1ee2da233fb00dccaf11988262df SHA-256: 61d6d98432cf0922757ba2c7de3d2f9368ab21db3a95d7d0010266521ce38e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised WordPress sites, suggesting an attempt to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The presence of external URIs and a link farm points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=cooking+fever+hack+version+download PDF link annotation
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/22461846530.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/minetegapeke.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/vevubosozapozipofokugib.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/lililozikulizaxos.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/gasizojexolonakenan.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/vezuxitujabibovaf.pdfIn PDF document text
    • https://digireg.gr/upload/vusade.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/47790404908.pdfIn PDF document text
    • https://kildevangen.dk/files/26398923415.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/91348971097.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/sokoluko.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/89773483208.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/badaganalefu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/miguruxinokugefu.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sajum.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/veovmjoda8grtfqtflhr734p43/xofapapixofemoretire.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614541e871fd8---33808351429.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/sakuxaza.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59a8e1791---75200676970.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/50089923144.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/16208838782.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/wawuf.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/zobopom.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/90976755658.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/dubudonurej.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nidumukem.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_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 10932 bytes
SHA-256: c8fa407012e96fb64513c690976d63aa6dacbeb61623efbecd1e359b18f8c371
font_01_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 17220 bytes
SHA-256: 7c96e3e91869c77ba983f4c7a39cc55dc65073ee30ab5a013e36899c38add145

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