Malicious PDF — malware analysis report

Static analysis result for SHA-256 4080917ebc4f04ed…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 05:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94c1b1a2a9cdff95508210169e532fec SHA-1: a989a97159c6fd32e38e44407cf787ce1c671de9 SHA-256: 4080917ebc4f04ed2c7286f2eb39144e6ec82db82be700973306fc03903b1228
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/84733986592.pdf In PDF document text
    • http://lauraestetica.com/userfiles/files/95683434981.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fctt32irlg0458mgkg2brrcc6u/gabebedavumakaji.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b76490dd---bafelafunoraluv.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/tegivumogavakepevebaduno.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fafb5224258815a2e4a198e28d09748d/fuxatupinamadunuxitalapo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/58thu9rm0u7mskr5mt9uq55pvn/3087191655.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/1n8qb3si7op8n94gnri550ipt3/80401218776.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/nifodosa.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/tekaretaxal.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/66524276957.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f1ae8608---gexuxojipuwusa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4946cae21644d6a4d1580439d2f2672d/kufonev.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2b28755a0---gaxomevaliburogaraweruwe.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/28650809887.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6b6e05f14cfc72c9c0f53606ecbb617e/21827365348.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38346214e---9710453661.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/45717919272.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wapisepakokoko.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/xafewikutujufuxeguwudi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bifekudetuzixekobuko.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/tosopuviwonatodategesu.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/61184428955.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e10735fc---pozuzudadoxanigigoguped.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/89885144974.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f024117---bokisowegajozubode.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e30fd4edf58---samunemafokuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=environmental+radiation+monitoring+pdfPDF 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10720 bytes
SHA-256: 2eff9f3e7ae62fc871ac70469936ac3b0696f1acf879502ed16e2ebe907c8d1e
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16956 bytes
SHA-256: b05f4342d6be81729888a0fd6254084e62a147ca9436d7e492511064443a9d5a
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1