Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8d417876fa74a8…

MALICIOUS

PDF

76.2 KB Created: 2021-08-27 20:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92e81d5e56828a6a03a86084039bd27f SHA-1: c4a14b9967089258db74360c89e106264ba99312 SHA-256: bd8d417876fa74a81f1533623d5a71c74b60ac908fcbb01bb63c4f29e9ccbfe7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://usaoxin.com/userfiles/2021-5/file/tefewefagogokipibup.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a58ba1795---rusuredadanojowutixoz.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609778e1bd47a---4836034160.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/19362986295.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075fd9464b---59935676520.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c599b6ead87---sirexagutakojekowusegase.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c6ea783b---65592033934.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vhlin23q968muloje6hgtpofpq/seteperiduferivasezapin.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/kiwewili.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/92016b8c17b4a254c893a9c40c69d4b6/kevuwavag.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/derapadoso.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/mozowuvapobebeki.pdfIn PDF document text
    • http://fluorescent-training.com/file/tejonarepatawutigogefefib.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zivivutarakiji.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8b15bb2c---fagaximafotovoji.pdfIn PDF document text
    • http://fruitvita.com/files/files/93248575152.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/46712815437.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/vodasivakazifo.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/guxira.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086933d1d745---gunemutizivomugod.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uf0dk2eesq2uoi53f4rk06pl3/11910918511.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/bdbbcef75f7eca61c45b5818dc30e178/6764263595.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c77c24e5---naririzolilazeviba.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/35359424394.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/44895043428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=let%27s+kill+this+love+mp3+free+downloadPDF 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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 11172 bytes
SHA-256: 76d1f4e07e0d84cb1a6fc04f4fb693c92267f756d2cd180642aa0cde26f7a4a2
font_01_sfnt_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 20176 bytes
SHA-256: f6ecc2f19f5b88219768e0ad1039593aa6dc4ca05681d66a9c75affc1c0fa90e
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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