Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25cc2a30c076118…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 21:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2ff6daeb3069652aeb7043521ed0444 SHA-1: 81008d96f15714344bad4a5e02898dada08880b6 SHA-256: e25cc2a30c0761188beb85300b95fbb7d3cde97d08661939bfee46dc15e19e34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing malware. The presence of a 'download button' lure further supports a deceptive download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=download+animal+crossing+new+leaf+rom PDF link annotation
    • https://cplastik.com/data/cms/file/39534314074.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/55698558696.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/61411781850.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7327d552d2e54a3c3a66987b73b2d657/gagagububafito.pdfIn PDF document text
    • https://greenways.at/userfiles/file/kevukipasediromu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/pojuxonufijuxomoxa.pdfIn PDF document text
    • http://schokobrunnen.com/idata/nutuwadapuxitivul.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/dixobezezewadusigi.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gebibuj.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7448758149.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/16689088686.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mdga99dhcu33vbijuaqr0hnekr/83965437095.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/nadebasetefopid.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/30936632219.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/sawajuwul.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/99261489672.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/vaniteravegunuladuk.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/namibu.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/jorasuf.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/86863310172.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/fasuriruru.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wudozo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/60944521374.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/dogaviwosiwemov.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131821caf00f---takanug.pdfIn PDF document text
    • 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 17460 bytes
SHA-256: 372a2d76602f56ef1808924dc2ef8a666737840a181aa60ea3c71408d5c18fda
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10808 bytes
SHA-256: 33305a42a4328ecc3d527fc1f7be18b0dbf7250d7741c63bf4474ec177306a4b
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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