Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4e3a24c81e7270…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 13:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 132921a8a380e6b92115feeb7991ec5d SHA-1: 9615f9c066e3633019925cbc39508ff695a058bf SHA-256: ea4e3a24c81e727032130120db999b2679e8975bce0547d3f7260ed657d5bbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e204063---bigiwasamu.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614445910a3ea---tosaxul.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/gexivuwujafekulejasusemof.pdfIn PDF document text
    • http://lejuriste.ru/files/file/4187255128.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvl45hpujv7b84cg50h1n8teb6/25659154994.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/42718275056.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/94580188566.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436c64e2535---gefidorag.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb97d42d88---femipudimaraxeberebapive.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/15320153213.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/vezolurugoziwet.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/99598356472.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613079f6a6a13---kefotuwapekuzub.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/76839829910.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/tixesofakodomagaw.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/63036767072.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/worosivojak.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pinuzuferikewiferigipan.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/38073231248.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93515995249.pdfIn PDF document text
    • http://teifsepahan.com/files/file/pugotinelabunobonu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xisozalenajedan.pdfIn PDF document text
    • http://baoveantam.org/upload/files/50008589480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kali+linux+android+apk+no+rootPDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 17272 bytes
SHA-256: 7ce10647dc3680d5c9a2e183415f1d04fc4248f70a5740e8d58b31679813355a
font_01_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 10368 bytes
SHA-256: 62f0602306a833d019d14d75dc1949451c9e126253aab7760642e7efb8d44cc7
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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