Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e713b5856374f0c…

MALICIOUS

PDF

93.8 KB Created: 2021-08-23 16:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94b5bb2d3dd260643034f8a174ccb327 SHA-1: b8a8172ce9c506f20a5029a28c86fe62aa6581cb SHA-256: 1e713b5856374f0c583800a42223005b4bf06bf8213121f60d9dfd752b36a52f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://ovalpolycoats.com/media/gawararerurisuzi.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d01a140c---41777232107.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210518045142_ilsvl8.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4126867723---8990111162.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zozil.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/72694142063.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/jaxukelepisazu.pdfIn PDF document text
    • https://atrax.hr/files/risupumavusewojivimud.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4948f93155f5bba2faffaf874d9c822a/kematoxozokelifokoj.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ns9isahcsfmk6hns42u3ob56jr/perevagipijulujezu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p5a61testtac2nt5lmipfls8a1/damuzejazebalisolaze.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/59892410998.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/79644824082.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/garurituvevifo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a790c3b9324---lelarakuzoboziponol.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/6550924977.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b66552d96---28883875056.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/91071235202.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/wereruxo.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/73512740673.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/62e85719e0db030b779944c49b60aa26/85375404131.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5dbcd21fe---76394585288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=skyrim+small+antlers+idPDF 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_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 17672 bytes
SHA-256: 59f06362528136582845cf85f99a3ad58e391c2a5f02a743ec4f04cefd2e9f19
font_01_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CD 10568 bytes
SHA-256: 04bbc5d3d519eaa13ab58a14419f9ef1d5bc6f46bb67321cfd9475765939bacf