Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e2ddb6887ce90…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 08:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53515cdf590550bb3011a90d905bff9e SHA-1: 6b00e8a1a137b4c6353604dd3af4fbeb24434ed7 SHA-256: c28e2ddb6887ce90346f9d6c1d611237889b90e488edb4655762bf9dbd64f2f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. Heuristics indicate it's a link farm on disposable hosting and that some links point to compromised CMS upload storage. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7fd02709---puwafikasuzepobimamerewip.pdf In PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210622_D25FF0BEF2275859.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d0dc07fa---walimaguruxuloz.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/22534008118.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7dmepa2f8s1ffrs91bgpm3vrs/nowaro.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/67563133198.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210609_3C2885A8631F22D6.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9ef9c8ea2011cf0a765fa775d61d6a6b/62904622448.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f2722ed---tedakezevirekomesekizewid.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561bba267c---zozalesubujux.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/xomofixasotakoxugow.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983423ec78a---xalasezok.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qi3f2hqob7d1jklpbj0g239kcb/meniwomazejuvowefipew.pdfIn PDF document text
    • https://curvy.tw/upload/files/51127894872.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606df7ae74508---45955412930.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe58549e59---sovowugibikodeguxuraluke.pdfIn PDF document text
    • http://mebco.ru/images/file/71929130927.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800e6f619c8---kubutakamozijeneputugog.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/mifowap.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/23531483732.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6090282d3---kumizarujijodo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/29552043285.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g4dgvis6c6sko6lld0lf4o5h4o/dutesexawa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6a9daf53c647e77fb8c0288c8614d030/komoxoveteduvukafekob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=problem+solving+in+organizations+pdfPDF 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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 17380 bytes
SHA-256: fe746ead637c35fb6b1be1094bfd5630d8839057dc5e45ff43cbe114b0e39f71
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 11108 bytes
SHA-256: e3863eae59f4a32081f5681bb7699d21ee67cea8c04c4ad720742d90d2904ea3