Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d3688cf6861677…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 07:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed3042b67a399aee21d125c1ed48cc24 SHA-1: 387edd96e6ac17ba842b5676a28fef732fffc5a9 SHA-256: 91d3688cf68616774b79600004ad3114874d68346d4ba62c1e65f47d670adafe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b1bb20500b305df0390e555be900fb70/roluni.pdf In PDF document text
    • http://lixtech.com.tw/ckfinder/ckfiles/files/19830815921.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/domejofunezu.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/reloxeretipoju.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/49940748161.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/38052799071.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/3042795903.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/gidaral.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43388209974.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210919_84B6FD618D48821E.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lifujitaxudorenevasubalu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/womenini.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/35649239947.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/jefidiratinuliri.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/napasabesa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136295397f2d---zewabud.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d771dde575---pofugeviwumoleturiwewex.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/csn1jqkck71ml6lkh41eh5mmr2/gimoja.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/bakanomanab.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/kanukorenomuxakova.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/53408979166.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mht9duatcqmn1filiqcdhdbls2/1734300701.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/lorifavuvoxemusidibetowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+a+portrait+from+a+photoPDF 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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 17480 bytes
SHA-256: 2f3dcfa0dcb89c8cba82ee0294a4649ec8e8a9240628f64e55da4a62811c782d
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 10392 bytes
SHA-256: fc38ef5c17b86dbb66c5108c5ca93a1d327529656ecedb3632788dbd0b312954
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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