Malicious PDF — malware analysis report

Static analysis result for SHA-256 377f5ec3fc22af39…

MALICIOUS

PDF

98.8 KB Created: 2021-07-29 11:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79aa625fe26347e48221540e8e491b20 SHA-1: 6dba4dfa0bf43e13205112156255873c016faafc SHA-256: 377f5ec3fc22af396314157a1c9b684b7b4e73490b181615585624dcc93c1607
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into taking an action, likely related to payment or invoice processing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://teknis.it/userfiles/files/walojivikimirejafomenap.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c944fd2974c---zixijilimoba.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zenusutivefeg.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/90047131215.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/13227907865.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db596c716---wameganomoluvidifipef.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e6d7f4ba---sovapixotebemi.pdfIn PDF document text
    • https://diphong.com/uploads/wosavipo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xejenisa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6f9822f8b153325f9b77f4349f32520e/45062452501.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/xolekamusuziwukovek.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qpreetschanr7kdp7eev7ea0pd/wuwolupexejo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210621032507.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/68125743558.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7474d88ffd168a9a7141f5728ba9dc8d/labawoxurilovevolajopumoj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8e3e1dfe---45540817201.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/69785525618.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b569711fe10---xilomedulaxagenixa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c4b9a62---wogodilo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169299a173---60388519173.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/87512650514.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zozimefinuwale.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a5700475e42751d1cc1ce2a89d34393a/5694441384.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dorozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pago+de+tenencia+vehicular+en+el+estado+de+mexico+2019PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11548 bytes
SHA-256: bf320e78f8dd5ad6069680aaa7d6d5eb8700bc83b82d0096ee211a105b6f2636
font_01_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 18468 bytes
SHA-256: b5d602757578521f7bea2a29fb72807302b90d2208d7b8a974562b36dac6ca13

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