Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c8f44827bae007…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 05:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 809fb4bac3d04a19c13a2eb2703aac89 SHA-1: 8cfd6b61d3f16ccec4d61decfd06584ef3d46f39 SHA-256: e0c8f44827bae007a694879eb556ade53b2d2a1336678ba0b12be380ad8bcd9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of a QR code lure further supports a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=emulador+para+android+de+ps2 PDF link annotation
    • http://tythb.cn/uploadfile/files/nugile.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/ruwufowi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/66885908267.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jijorig.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jeletuwavuxuleropexozad.pdfIn PDF document text
    • https://trainova.com/userfiles/file/viboxonizemox.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/daposinanevawesufujotov.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c222ec3880---197144570.pdfIn PDF document text
    • http://classtool.info/upload/files/50741878250.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pizoriderenusowe.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/30398304798.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/71044093448.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d65d0579ba2d074ba1948b4e8a77e7c0/90070696229.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/51234526776.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/zuvexuvewuvukumodijaxejuj.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/bufumoxomadigewum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e30c12b4c8---zawagajogagariron.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/zomenugumurat.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tuzogivezujijud.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/5840453687.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nipixivomasinivoteba.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pajawidunadefe.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/kigutiba.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/1867598710.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2db10c55---43192863993.pdfIn PDF document text
    • 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_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 10660 bytes
SHA-256: f7a1f93e4de5febcc06c1a439848092cb5ac26afd0d97bbd5d90285de05d9032
font_02_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 14676 bytes
SHA-256: 5842e13dda0f2d5e550cd844d6797f702fca97ca5b60b4e57af8238cacc23b42

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