Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f851dbb80c7d795…

MALICIOUS

PDF

72.4 KB Created: 2021-10-05 17:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 038f7dd1c74aafc553464e183a5c1ecd SHA-1: 9aeda0610e0ef0e9d9752b6c77a062905f204110 SHA-256: 7f851dbb80c7d7958d24338b04ca7bf0ab255e40ec39e237fd63ae0056f74423
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for further exploitation or credential harvesting.

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 https://catamma.ru/uplcv?utm_term=neet+past+year+papers+pdf PDF link annotation
    • http://elturo.ru/img/upload/files/20911907754.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf6353c3b---21504216152.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/78926996259.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wedoxi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210911140150.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/36482371591.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/51443088491.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece829b80a---rosutujoburulibofatosa.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/ribemewumozamusuge.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/gigorujakijiga.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/6502491335.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/zosaganebexuwijowen.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/zelune.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/mugib.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/2804217183.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/jajukovadiretuta.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/mujavesupupagugepivig.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/sekagitesenadutexuza.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc2ea0436---61602583169.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/50228841895.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d1856d10---58312973263.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kilotijidiparoxo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16159b4a97f84d---zududok.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/64097671850.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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 16712 bytes
SHA-256: d47621f0b3363a9b0a345d537e5e0ff5631b5e20029690e49689429242914bc0
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 10220 bytes
SHA-256: 56924589b5f8541ed63b8b1bf37c88fec0616055daa82eeac9aee7fbd4118c28
font_02_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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