Malicious PDF — malware analysis report

Static analysis result for SHA-256 59878d287f1cdc60…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 01:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6588848eed03abb763cf292a150b6369 SHA-1: a6286b2eba7388f682ea82a06711a49c2ce83507 SHA-256: 59878d287f1cdc600f44f099b8ad993ee5a6df5d52d2ca2793d02f221bc0d29b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eastmanllc.net/ckfinder/userfiles/files/noraxagepurujulamumit.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/kiziw.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/62817045180.pdfIn PDF document text
    • http://nincity.de/inline/file/97706987683.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/teviparapupipevelojup.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/binov.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210918/files/20210918052933.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fg99v2ikpqfkdi3asoqgk57kmr/balozidupuvajufepozozokef.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145043e2a5a2---12728951593.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/90075220482.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/90820560587.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/76927546801.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/webepegitetuzabaku.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/sopotovuzonovedesebeja.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/31019718143.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/088ed72495eee866ff3e15116b884bba/zokozisufewoda.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/39181833956.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/viraxovogafebesu.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/mumomof.pdfIn PDF document text
    • http://mfahk.com/upload/files/50712376681.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/moxetenurunewusorujamar.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/xixomipag.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/15104547533.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/titevixojuxiwevokuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wifi+hacker+for+android+9+piePDF 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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 10660 bytes
SHA-256: a86cae0b688bdfbc84d2b167c15029e84b1711e4cf8a4129e4dcb56b9047aeab
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 16940 bytes
SHA-256: 9f17d30554fa55a55130549e4208eb95a47063dbaf5a5fd941de5afa87f11740
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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