Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18b042c73cdaf52…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 07:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64a0744bc801b9433d3afae28c16d2c8 SHA-1: dab6d0f892161a014ce4ff140ca9729e5bbfa1c4 SHA-256: a18b042c73cdaf52a5dc8b6e444dba7c979af1f374648caf7b3bef21c8c15a3d
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host further PDF files, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious intent. The ClamAV detection confirms this file is recognized as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=fnaf+4+halloween+edition+download+pc PDF link annotation
    • http://lexen.ca/userfiles/files/geveragegasawudof.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613819ed66559---65140676553.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/16918559748.pdfIn PDF document text
    • https://path.mn/userfiles/files/kogon.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/72013924483.pdfIn PDF document text
    • http://ingore.cn/upload/files/mamibelufavagobukotamisu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fatinimusad.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/3694737359.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/61466489370.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jovane.pdfIn PDF document text
    • http://thongthien.vn/upload/files/namokodijuwulid.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/29583615916.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/tamabibixezijor.pdfIn PDF document text
    • http://foodchemsino.com/d/files/38084149595.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/70731535626.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/nanokilepegevamurifelalap.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/4431951371.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc75a722e4---72332248678.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/12019358422.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rijokufu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/81901840346.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4ebkd530mlicmu301u0kkvk2v3/xejija.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/10447075626.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/88695092425.pdfIn PDF document text
    • http://rsst77.ru/upload/files/zikirokabopamun.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dfa6919e10b6eba118b638354ee6c874/sizaguwonowikajegaf.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/furameta.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 18180 bytes
SHA-256: b7d59c7014d5e90df0dc6c3ab47f707ade4119ec89ce60c5c44258a3372cd5a6
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 10588 bytes
SHA-256: 9b6a26a3eb16aadf2cc68f05ce042fe1619cc9bde2aa2abc4667b3fcee0b3d58

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