Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd330c78bed54e…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 04:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed8ea734bbafcb83d51a0193ab764fe0 SHA-1: 58b873a103899482e1ed8282cdc9b64ede334254 SHA-256: 69dd330c78bed54ec96a2982932d18f017164ae05ee4d69c7c880c7baff7c233
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://astek-telem.fr/userfiles/file/vewasumebofodebup.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q867n61tjsa2j68c59859dkf54/fajigiwamotejo.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/36585914511.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/21773649894.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd613c0774d---42079823229.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/35012fff18c224598ae62a0a014e1af4/22010311324.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jigizidupejodufitil.pdfIn PDF document text
    • https://luminex.pl/upload/file/lasufamamosafoto.pdfIn PDF document text
    • https://istanajp2.com/contents//files/64156720534.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6456f897d9e975aeaab3c59a29e05440/48058159433.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609576218ca23---19981784783.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37073784b---14039192866.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///83269383088.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/sogikun.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/xozavobesudamukifawa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7aa681a9a44098bc98118dead49d4050/patotut.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25453905093.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/kejuvenodaxemulam.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/buritadateg.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cbffd0034---fijaruxujorimogunog.pdfIn PDF document text
    • http://gojjang.com/uploads/files/mogosefubifexow.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tugosuxesuzulu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jolokuku.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b4ad5237---86384488343.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j8mc9897b8chbfrn3v9f8pqbkj/zajinosemejejopuresazoni.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/14814399872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+fix+my+toto+washletPDF 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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 17368 bytes
SHA-256: f64914c9dc03056e1a8d1567fb1a4634c78d226018f6d65c400bdca14ee7bfeb
font_01_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 10708 bytes
SHA-256: cfc93f039a2f6abd5b1cb10c176cab2dbb9bca0499160fadca0f67eb8d13789d
font_02_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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