Malicious PDF — malware analysis report

Static analysis result for SHA-256 b311565521e5f87f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 06:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 416fdc0005a8861093570602bf16b793 SHA-1: 094265078abecc3683c657ec5e6cf81bcbc14e61 SHA-256: b311565521e5f87fc2d5b9cb3e2a8098c5c75c86147206ecb6ccf5805e30729d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate these are likely used to redirect users to malicious content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://smidgel.ru/uplcv?utm_term=cactus+coloring+pages PDF link annotation
    • http://cnhhgj.com/upfiles/userfiles/file/vovuke.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce4ec8b5c3156db7580a8c9ca32eebac/35938198324.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bazujom.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/88190873336.pdfIn PDF document text
    • http://meskerjager.nl/media/files/jorulelifadasegafaxipug.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4edea12e7---zajatil.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tenapunozovufovifevirizat.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/67848286762.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/disaxefaridopek.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tulajepepiwuzefamer.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/39232214016.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/3jjdu0k8mamvnopug0mkfq4cpa/94298585121.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/gametok.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/rewaxutipexowanepevuja.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6c9441e77f9ec88e5438ebfb7bed2d44/xanenax.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1cc59ac9---27106476101.pdfIn PDF document text
    • http://huefpdf.org/upload/file/kawutadifusufasekoxi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997c0f6b3cb---53440163695.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cde94a78---lelidepivadazomogud.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/logufalimunagefutasojivub.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6902e1fd9641e17a26cdb077e7834f92/37784615967.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0e43df8af---21416126330.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/kezevotobupitofana.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/579ded3b5145fa617b4e35ee4b41815c/12710747097.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/51991562223.pdfIn PDF document text
    • https://bioesteticaonline.it/file/jagumalezebezagar.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 10680 bytes
SHA-256: d2e8ee4e254799e5137d082b9c877df7e0a7f6c3e3e65913eb7946a586d8c8cb
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 17356 bytes
SHA-256: a20c8a43473e44768313ba6e535c13c9349b12ec122f4d2a3e53451c82357c91

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