Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cefd6c225825ea3…

MALICIOUS

PDF

97.2 KB Created: 2021-07-31 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 203111243bb58089e65f0b93178d53dc SHA-1: 9c5e96e0cc3fb30863ffd1f35d885430af984381 SHA-256: 4cefd6c225825ea36adc719e9bef749e646379fe97dd063490739a4ff477d90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://emmaushuis.org/pages/lumilekevosiji.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/75355010476.pdfIn PDF document text
    • https://area5srl.it/file/53086116295.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/03237d3104b7fd216ae16c4f86a28682/99795543482.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff423e888---xubekera.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/qa1r1boju4eig52l00h7i9gjck/28750535638.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/99rqnamd3o9qmih82fdqc0o3il/43426143624.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wuroxuvi.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/25817581331.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gaxipudesadigaxuvi.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/67694472681.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/25f26bbd347ef5c317072a451998713f/19070720915.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098395f82194---80850704150.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/95889876131.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877f8409b53---taxitizovakidukisumi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/ximipajojud.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f149717c0671e73553b3c3126c1fd145/12645361753.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/75019086956.pdfIn PDF document text
    • https://vestol.bg/files/file/7872793289.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wadagemoxana.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/49252695751.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1812f42690ed26b0be416c9c42b898bb/pofilakuwotokusudotat.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/34642798500.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1vng2f30dogd955861ncdk70ui/digilusoduzirofiraje.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9c8c0c5e5971277abb282561d0a01f80/ramavobotibepin.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/nomewapum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=howl%27s+moving+castle+book+and+movie+differencesPDF 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_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 11228 bytes
SHA-256: b94395f55da17335a56bfe0302735a0a9f6c0f53f47bc7eef7fb26cc550b8a70
font_01_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 17132 bytes
SHA-256: c42031986c7fc817c2ba1fb365651a2e7d8b00e7396079dd785fcca6e7b857ef
font_02_sfnt_off00015e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1