Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5d6c75d8a68436…

MALICIOUS

PDF

81.9 KB Created: 2021-10-16 16:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef23e1cbb9967b81146b0b3ef2666031 SHA-1: 349dccd3055036fd10910f31adf1ba9f2da0a02c SHA-256: ae5d6c75d8a68436ce88666b34aa98eee7757370aa1aeac0f765f55b50456e89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and the presence of multiple external links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://eclearusa.com/images/file/90870179989.pdf In PDF document text
    • https://maxflowfans.com/userfiles/file/75363279326.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xopimojikodegajoru.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/bevupibum.pdfIn PDF document text
    • http://lagrupacio.cat/file/domuwexunalimile.pdfIn PDF document text
    • https://designclarf.it/file/88446725848.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/bevopedizigelatogos.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/96376805449.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/sodapowenuzawawegemap.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/22236912551.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/mimamut.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615e6f6ab51b3---59276273777.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jipisa.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/16465391086.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/59892708726.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d19013da4a---sigikupe.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161441170915ff---9622089804.pdfIn PDF document text
    • http://ombs.ru/uploads/files/87941004510.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a8d980f471---5559072315.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/57612858241.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70735560636.pdfIn PDF document text
    • http://thietbinuoitom.vn/uploads/userfiles/file/zitujiwodiwiduvapogo.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/24368388374.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b011fed096---refawozak.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/58926251841.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/140634316159.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jiwapikevogamefopasif.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=similarities+between+mitosis+and+binary+fissionPDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 18496 bytes
SHA-256: 49d76223ffc930cc4b55b867c9be68a6d2fc2c99b550ad5df4ad51dd07f10935
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10932 bytes
SHA-256: a536ecff1a7f2ab0846fff9d75a90b843dfcb29bdc259d4d0134c203a352e298
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.