Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b733fa10de22510…

MALICIOUS

PDF

82.3 KB Created: 2021-08-02 08:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4c4bf522298ffd849759f2245ac1e876 SHA-1: 9b375426cfd04d864aeca7d1be7245bc86e0855a SHA-256: 5b733fa10de22510fafad03c495577c4f3988a3af67fc94bb898fac048b3509c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://botosani.ro/img/uploads/file/luvebemilabele.pdf In PDF document text
    • http://sushi-belovo.ru/files/lorigirawivufegiz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c692408bb53---41076467189.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6e445ed38---sojofifivokoxu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/gizisuxukimeb.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac6d7987a---20296262598.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/49807810178.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jewapejebib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/quk86loschjfaqc7kf2tp0km07/fulutevan.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210718_A81B851B00707551.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899982eb755---ruroxekibefinixikimiloje.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c149a7ae0---26279736318.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9161def72379c579312c0cff6568cc5f/36442604565.pdfIn PDF document text
    • http://dhf-china.com/d/files/67523071295.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/90636687227.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/kesifaf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e520dcc28e010dc5628d161de4e22b/saxerex.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d490a04d4c---xoreserujedatesa.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/geximolu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cp8vueltj2gucrr1cltackkhd4/ralisifapupafirapavuru.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tajimuferesenoku.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jirololirapetafaromo.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/75915478961.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210729_153038.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/xivipenupusuxunisofugered.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/43594043445.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/79785400865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yeezy+350+v2+bred+rafflePDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 10676 bytes
SHA-256: 02745fe6504a31eca57d07612e660d76dacd0833afbc88067fe6b2a4da5c1a13
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 17584 bytes
SHA-256: 06413ba8cdc036e4281243680e52f660fb8d4af88b59b1d09070fb8ed7af43c6
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1