Malicious PDF — malware analysis report

Static analysis result for SHA-256 4144c8d7bc0b720b…

MALICIOUS

PDF

94.5 KB Created: 2021-08-06 00:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 689feaa246e46f88199f8408f8cf9a63 SHA-1: 72190beb6155febdad1b95d141bb717bf6188980 SHA-256: 4144c8d7bc0b720b236f6a72715f6cd5d925564c5b1c2cc98cd483710432f58b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely attempting to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=exercices+corrig%C3%A9s+statistiques+seconde+bac+pro+pdf PDF link annotation
    • https://fokusmedia.com/images/uploads/sasavesotupigilem.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/verijumagituwesegoma.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3145ea9fbf---26184644991.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8659be90cf---pubarewuname.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c78790541---lenunidetoxi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f613598e26f---nugizifopafajomifupuzip.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000a501449---vegubufudiwopanetalolepul.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/144051281.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d53e59ae---99254818902.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/68282640384.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/6360938728.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/prcfokk7s1j3amndapl9r4crq4/tedagu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/37453658635.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210615210133_mvsfij.pdfIn PDF document text
    • https://hoongnau.com/upload/files/zafoferozuwuvarixu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6609b62eebdbab2d122e5c29c364b273/sejitokapuzugugevumub.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/50323881286.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160735a1c12723---razaxifabixajalipibitu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/nubenopegimepijejika.pdfIn PDF document text
    • http://shosholoza.de/file/gelutofatirolumetefogome.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/xulotewivufolugomofuge.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210627064358_f6c3gn.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/1721743431.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/rileba.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_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 19780 bytes
SHA-256: ad5033a1aae881bd40c2d064e40f0ebc91186c6c45bca9153b517f76b1efaac6
font_01_sfnt_off00013719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 11372 bytes
SHA-256: 8c651b00299a00e2fcba4746fa26970d1ecec007e890b9713a6c650d6496f240
font_02_sfnt_off0001510d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.