Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e84172e4f081d82…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 18:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfb0c917a53ca8488d6a97707e65e1a9 SHA-1: 5d58fdf1c676710be2c4e823661d3b86872b2fcb SHA-256: 2e84172e4f081d82f4951b0fffa9758ce6a47d074cdf421a1141f96d96257a2e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5642c17bc---kelazamutuki.pdf In PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/pukurozijenuviropexu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/36699088713.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce8e0d711---62783471481.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/19470041970.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/27699110681.pdfIn PDF document text
    • http://xsteelstock.com/d/files/53534647145.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/77240489135.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/wodazi.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/29553720526.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/rofaxafemivadofafevux.pdfIn PDF document text
    • https://btegypt.com/file/35201103798.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/53800417679.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/norirumamiwarotobid.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/durixudumizugugaziki.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/pisatijo.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109102006395780.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b77kjhai612lp43l3equg6ig5h/16061545980.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/78588918466.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/roramem.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/33789189528.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c13f17fed2---13090172745.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/53869899755.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/9788757820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apk+de+naruto+slugfestPDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10752 bytes
SHA-256: 7ff68a5226239c88e0ec023ec52490e91f721dca907083840e7bc75ac509d23a
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 17644 bytes
SHA-256: aa98c6bd56d9e025054c8f2f94cf02c881f41b9c43ea20960920561b9ec2d74f

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