Malicious PDF — malware analysis report

Static analysis result for SHA-256 87677e7a4e2a59b8…

MALICIOUS

PDF

75.3 KB Created: 2021-11-12 14:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 22ffccf449520b0e42cd90a5650455ea SHA-1: f0781da5835098fcb41e15e02f6d476205da6a59 SHA-256: 87677e7a4e2a59b8e0f4a1e80e6d8bf49ce4e805b93413f9505faefc827dc4d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f25d6f785ca35534aa8f5ea73268567e/61099792798.pdf In PDF document text
    • http://mayingiabao.com/upload/files/37232462641.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/verekimuzikodif.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/38891715406.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/juwamurepimawotuvuvamufo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/bajilut.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/levixizo.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vafamanof.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/45065441835.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vufivosidirunusufeleji.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/11937279536.pdfIn PDF document text
    • https://aneri12.cz/res/file/21207551363.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/zibutabenixididon.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/zevaxaputisa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4niuv96i5pps2a54gu08rsn72k/lanuliwapapugorabamiwifa.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/93431247653.pdfIn PDF document text
    • http://timebymtm.com/upload/files/87113753350.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16180028f1d0c4---nofewosoten.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/69092282001.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nezazepikal.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/lekiregoxodasobijobax.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161353fded0d86---velapibekukusi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/33d82279549df26f4449a9530ec2847d/zekudovugozibugav.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=naturalisation+certificate+contact+numberPDF link annotation
    • 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_off0000c063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC063 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 10712 bytes
SHA-256: 1ff8ce0c530d7d101501b52d2d417ffb23413197a97f63a38926e2b52d4d6b88
font_02_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 18224 bytes
SHA-256: 7fa4762a6e03e0ae8285d563040c88a65e54022188ca0290229bc04f635782ed