Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4d2ec446fa4979…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 01:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 866f68afa12e67f09e1e42ebf965c2a4 SHA-1: 664604bb6674cc3fba54c980503d5beff17ee608 SHA-256: 1e4d2ec446fa497946992a7b7f4ad090cbe58d2d62714dbf51734fee2c155895
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://parfumerieindex.nl/images/uploads/razukubezufonakateweza.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/2181583180.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161561ab0b126c---99110822606.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/69860229855.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908163229.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163260844357.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/53149211318.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/lutezukuvufemepigu.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20211001050751.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/tagetawosudojemibizile.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/mewamejipiru.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/varawaje.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/15034672422.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/jegonizezirigexobelamewo.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/32385664062.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tunudotadevozitapo.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/mulakevunojo.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/99081264889.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16155e933a44c1---ginutuxupikar.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfaf1c8d961d04ab95e0ee84577718ca/71193372266.pdfIn PDF document text
    • http://vaithun.net/upload/files/moxupuzomedu.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/55072948561.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/nukeseredawisilop.pdfIn PDF document text
    • https://pratham.one/file/32706099223.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/xavomoxejeno.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/fosirofiketonuk.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ml6jrpq7v7c1369394kppr6n7b/36609667704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=turn+off+battery+saver+androidPDF 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_off0000b84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84E 10684 bytes
SHA-256: 36f9b6f2f46113c5b3d95b166ff5beb9648cfdba1eb7c0cff733bd3983310fea
font_01_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 17052 bytes
SHA-256: 6dc86b8732933df0206759543c4169a11018945045e91c966af8675ac1d44159

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