Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1390ebee383a89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 05:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bfd1293690873b86fa985689519a2e0 SHA-1: 7da1dcc8b89b6eb88df86cd3597b0449462b5935 SHA-256: bc1390ebee383a89ef399063c7aa50ce22f7c45bbb2587ea4bd65d9ed91912de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jjkxmy.com/upload/files/202109070414411156.pdf In PDF document text
    • http://superazs.ru/images/news/file/24782783084.pdfIn PDF document text
    • https://onlinendttraining.com/files/parizepaj.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/zutoribuxelakuza.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9bc061eb93b8517442914ef2ebf47081/33006886086.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/72515588719.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/56967991016.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/lusetupujo.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bejutozisodifixu.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/98720791561.pdfIn PDF document text
    • http://coumert.com/images/file/mexidefugi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e18fd00ff---papizuwezexabolusidaxam.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/garozepijajekodasagur.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dilopatalakapafujipe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wulon.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109120911575605728bot9.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/lagebojijiturelevog.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/7773591611.pdfIn PDF document text
    • http://salkim.com/userfiles/file/14577605942.pdfIn PDF document text
    • https://majubesar.org/contents/files/forivedajufutapelatagawu.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/soxafo.pdfIn PDF document text
    • https://equinox-e.com/upload/files/bovev.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/68111566572.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/12940308385.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/ritabikifujazufupufokox.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rulfatds058uv4iofi921sb1t1/80606791143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wentworth+season+8+watch+onlinePDF 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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 17344 bytes
SHA-256: 6931c0801e3e909e08262ee7d27804e690db58f63be20444e30b5ae7c19f0be2
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 10616 bytes
SHA-256: 22dacfac78d0b89de97b140a21b35170ae2ab6b4b7280d5c6aacf1bd72b14d0a

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