Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c39fb9d4f04ece…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 13:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e049a42b2ec1dc296a0e48bf8ca0f61b SHA-1: ced218f0672a74c5b0f3b640c44022d203b51b70 SHA-256: 88c39fb9d4f04ece48dc7cebece836bac692dce33c01451421155f3fc7b880ea
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0895c924e---xipagadem.pdf In PDF document text
    • http://transfertrolley.cn/d/files/24924823891.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fejuredodujotivinas.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/33156834962.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608038e1b3392---15138890214.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/guvugagufopoxo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9dbf1352192f10c0366337969418dfea/petatidazuk.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/kazuxenituk.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/25cng6quikpe15uvpq4l3js2cr/6969977837.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b050cc3a86741f963ba4f95ccc33b558/78092606175.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/nunofuvokadi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wuxiserijikinopazebufuse.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gapatus.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8cdddc679466cd2f52d55e8b25d186ee/7276648143.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/pekitezoverisuvolonajedak.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/69041126449.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/fuxajabigisevarani.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2bkt9smqiuupok3je57dnfcjqj/19763165724.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/ragamelukizi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/554838fd98470f3e65715118210a5fa9/41455811929.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17788291011.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc45e0294---24667237444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=learn+excel+online+free+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_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 10404 bytes
SHA-256: 42ddeb19f7a5922b5ed05e2c2f12d29f59177921ba9ad5f69aa443564180c94b
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 20492 bytes
SHA-256: ac337692ac0391185c5907b30a3d11463eca5141d23e3f60422184a787501abd

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