Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda727df6536393e…

MALICIOUS

PDF

72.2 KB Created: 2021-10-12 02:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6fb0dd9c98ca40dce7bdb7fc6b729734 SHA-1: e649eb99437a82a27e4bc0b92210d0bffacd9dff SHA-256: cda727df6536393e69ecee71282fc44ffa2cecf5af6ca417fac418f724f8a75a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The PDF also contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/fekoremel.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e4d0199728aaa633dc00ab6d0bc54b15/86792366607.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/viduzilelefivinerejob.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/3157366529.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/43370836642.pdfIn PDF document text
    • http://malifer.hu/upload/file/94786949959.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/fadozexiwegowunula.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/sutiga.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/69013831358.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/niligedive.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/romovuberowikarowij.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_140337.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/51077113041.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/11502070599.pdfIn PDF document text
    • https://viettrungson.com/media/Files/65662173073.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/17143115729.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/fotiwifezuligawomekajid.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16164b01718d08---14440880950.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/47214875794.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69ff07985d560e64cf1429a013715536/20584952548.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/rozan.pdfIn PDF document text
    • https://kinohorror.com/upload/file/tonabebeb.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/toxinepefusav.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wazozomifilopisatezidarak.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/zarelutijavem.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=long+run+equilibrium+of+a+monopoly+firmPDF 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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 10892 bytes
SHA-256: c82807cccd543db572a7924f35be25876aef9ef02f3b7a4bd080b724ba119834
font_01_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 15252 bytes
SHA-256: b7aa5a81f6c801c83f30142fb1d33034e8a61e3444f0e27221adc236d0a8012d

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