Malicious PDF — malware analysis report

Static analysis result for SHA-256 5690fbf320595fc4…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 09:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5205bb6e6953e4854b30da50d704d17f SHA-1: b408e21591aa7ad40aed41e23afccfa639524c17 SHA-256: 5690fbf320595fc4c60f70b7d6fd155928281e7a310805bd684ef6eba4fcf773
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=ellen+g+white+patriarchs+and+prophets+pdf PDF link annotation
    • http://alpha-th.com/userfiles/file/nigiwunonudusokonivumumow.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/sibeladexezavuneriweka.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zilolezamisomu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c28014b00fd6212060346ccbf4ee7292/10293725832.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/japupolet.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/42072768149.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/boxusobakutogalijikojuto.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/94819785408.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad9f08f6---jefirite.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160771c380127d---69549524191.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ppjufknbuvve1ge9a55ethctu5/jomexeviwuzesapoxoxi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6ea0bb03---60997826844.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/difan.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/83145340311.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/megijuxoporogapodetidul.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/72979943147.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/gubatal.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/99668891039.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/luwefupaxud.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/nuwujedusuminagexubumonu.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/91034918875.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/23348233441.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/kelamagaxubovojijofigapo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d98661924041a641f598e33d6bd55f2b/nigilovad.pdfIn PDF document text
    • http://webbuilders.com/files/file/gegosebufezabaf.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef7b8e892---befisemonodisijizopeminir.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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 10968 bytes
SHA-256: ec02cc7b8659d02d3563f27ab58c75469c6a37eb2f60664ca181f17e1994219c
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 16860 bytes
SHA-256: 54f069224e3430b7d449aa74ba6b818614f82c30f2c2d4c36dce08de53069451
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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