Malicious PDF — malware analysis report

Static analysis result for SHA-256 995449af2d884387…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 16:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d82dad9567704371a1814d5d5832f0e SHA-1: f87d778c6fdac7e469e4ff8d84f1f777bf5d2075 SHA-256: 995449af2d8843878df10d0f388ad6a021c67f5004c828102fe7223592b7fa34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically identifying it as a phishing or trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0ca8a406---49159177322.pdf In PDF document text
    • http://allycatering.com/userfiles/70283552994.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26598349386.pdfIn PDF document text
    • https://geniodelweb.com/file/58333108590.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vofefuxifuvu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/didobonadovemagosixutugu.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gotowomuxuf.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/28395199829.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zubasufu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/jasolonenuxopagani.pdfIn PDF document text
    • http://mariancozma.com/_user/file/karutepifinizile.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/zelotifam.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xujupodanonigevuz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3089a3db6---27854191321.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/24712444209.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109041650566498.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/80012124165.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/mituwutuxidinazategajunov.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/zemolalalotibebip.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/85087203311.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lemudidabawa.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/teligupoponoxelupipi.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/54117401935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=new+messenger+for+androidPDF 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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 10616 bytes
SHA-256: c71297fbc879fb73fa339edbb0f96b7da43da6e9703998566e5e37dbe8ff51a5
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 16916 bytes
SHA-256: c05a57ee375aecace82aea2eecf8f57d03d26f6f6de9ee11f2b654ac21718c1b

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