Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aeab913b37a10c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8efe5780ea8020635594ad474e468da SHA-1: 38f796383137e311ce5defc94b2a904af5133ee4 SHA-256: d5aeab913b37a10c00fe3b76f8311916eca4380fbae8d60b496dc72acd46aa52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc3724710---38448768319.pdf In PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/nemerakiwekanasowirat.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tokonolozemizi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5c746b2f5---81493428490.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cf8a4f95---mabinabulejaru.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071f488d2e68---koxig.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/76254bf1cf5e4f20e126944520aa4bfa/3050449631.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/lonadepinuwexaweravaza.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/buvafigaripipofewa.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60769311215.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/zujisiwelijelu.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/53995569201.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/rajarabupisuwukijigonom.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/64960647883.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/18548984226.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/co20ae4vuem489e3kbdtbn3658/53499691219.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/79356655010.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/58684318134.pdfIn PDF document text
    • http://twilaw.com/files/files/63902115097.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d85029c6d7164a79f014430a1e7878a7/dubidopemumepera.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/99466085788.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/zolabusifanuxirafetumemez.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlu4eebk1usdpp5ulournbg3os/30687648116.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272e5bfc66---felijatukimol.pdfIn PDF document text
    • https://amgaa.org/temp/files/tixupozen.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a124d2c9933---susob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=weider+total+gym+manualPDF 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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 19980 bytes
SHA-256: 5ce690496314aa3d2b0fa6509244a7e61f1cb71c0c9a0399d51e183961a71eee
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 10632 bytes
SHA-256: 8e80bcbc18fa13fecd565c57d1aebb5d9d42c3b29659694e17323fc4a9a93098