Malicious PDF — malware analysis report

Static analysis result for SHA-256 0219b342826aa46d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 11:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83e61cc0756a1ab54ed89a3cf31a6697 SHA-1: e0a32fcc7af1b2e42baa56e705773336bce53084 SHA-256: 0219b342826aa46d45c9f7d2d56db99f75ccdba88deb554a477a00342d64d253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=rem+wallpaper+android
    • http://a2kat.ru/userfiles/file/kukebawakomafigofofeka.pdf
    • https://fnb-concepts.com/images/uploads/files/nixurobo.pdf
    • https://wheelmartthailand.com/image/upload/File/28097797318.pdf
    • http://abacusnancy.com/userfiles/file/fugikov.pdf
    • https://morethancars.eu/uploads/edytor/file/xamafusikilusizipomosezo.pdf
    • http://namthangbasaltstone.com/uploads/image/files/72716243208.pdf
    • https://foundationkuzmanov.com/files/femibijivaxalugip.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/kuxamajufulonuzejawanobu.pdf
    • https://alicantea.centralcms.cloud/galeria/files/sorobapejesusovap.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/47428111715.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/sepajagesixajab.pdf
    • http://valsadindustries.com/userfiles/file/56677122431.pdf
    • http://elcolono.net/userfiles/files/41215878955.pdf
    • https://liur-krd.ru/userfiles/file/paketazit.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b8d562ed---28023821363.pdf
    • http://nuraski.pl/wsg/userfiles/23750695697.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bc130ac7ac4b8b0d493ae2033109e6c4/gerofekikilapopakisujog.pdf
    • http://konemara.hu/userfiles/file/38886380217.pdf
    • http://grandviewcommunity.com/userimages/sipam.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6987e00739d227a7d321e2e3f25d39b7/panoxejumokolupafasawateb.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7db137d6edb90e91455e959e8f92a8b3/54259079731.pdf
    • https://semangkamerah.com/contents/files/joxikuduluruvadufu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2d220cd43782e82488dce7a6e5db8f8f/48931758191.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/88305303788.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 16792 bytes
font_01_sfnt_off0000de65.bin
afe9817169f30080be4f5dfbb12c57fc0d8e0d3050648f88fb00b300652d185a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10420 bytes
font_02_sfnt_off0000f5e7.bin
9d1296019df51cabffcc81a9371f01dd6940c24b8d5fa6fbf1253728b1b57e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16792 bytes