Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd77eafc3fb2490…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 18:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40f9dc71af2f31078b95f80e9df355d7 SHA-1: 4490a905ebe108b665019f758298d403c683698b SHA-256: 6bd77eafc3fb2490c846b572da03774d08eaa4055fbcb95de3e633254f7abbd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple URLs, some of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zafidufat.pdf In PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/68379832017.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10427819275.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/zozumu.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/2930251742.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/menetujilafidomofevoram.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ce590c1446.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/17669971958.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/11657487462.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/29723247541.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408f9a6df72---53963658766.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151424595513.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/5337400555.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/pipukakikivovimobogax.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/panidilixazapojubukafur.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/vamapomemetibemilix.pdfIn PDF document text
    • http://regmac.net/userfiles/files/funudi.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/8006588383.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/xuzojobedopozefidim.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/wuxinitu.pdfIn PDF document text
    • http://mamitobe.ru/files/file/toxikelokenijizipujimab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0da40f7f---24527199724.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/93952700292.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462ce1b6f6402754f40fc012209ed4/widur.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xofijabewufek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+hero+academia+season+5+episode+2+dubbedPDF 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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 17724 bytes
SHA-256: 85db99af772aa56eaf934170bac6b0fcf5f9bca343576848a294e3941cd5fb30
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 11236 bytes
SHA-256: 3b495706723625e4f1519a85aac47651af29075538405a9d7fd17f22b2bfaaea
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1