Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dbe9da7bfb7845…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 01:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d619e3014a529368c92e969ec3866da SHA-1: 358212669d042f0fe9b130f31908059088172740 SHA-256: 70dbe9da7bfb7845884ea9e8a7c43c37a207d9a1b6d48e1caee5bb288e9aa552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on compromised WordPress sites, indicates a link farm designed to distribute further malicious content or phish for information. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

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 https://smidgel.ru/uplcv?utm_term=macromolecules+worksheet+answers+part+d PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1a40bae92---nuzuv.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/tokikumeruzeworugitipu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0mu53s8v20orm3fmtv75p3huu6/70944259353.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/foduf.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/v5a9jfeda1mh4kjb7pfher24dk/71672785545.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072822e45421---kololunesimiro.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/81835502588.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/54687268639.pdfIn PDF document text
    • https://auto826.com/uploads/files/mewegufotupo.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/89236537123.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/abe17e45457960ff3294e160bea21664/3532021868.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/dudiwuvinudexefibumawowiz.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/33506622679.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d63ebee99---dopolapiwolufoku.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/844486415.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/sidurevo.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/64109136901.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jepepikuwupemorikurisaj.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-7/20210807225702792464.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/45063285699.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kn6shvil4rcmocjfisg44c1k16/73235083241.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f7fe0ce2---kepiwodarerewovij.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23484494946.pdfIn PDF document text
    • https://digireg.ru/upload/96114700175.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c9931fc1ab9553196e16b7b5e63969a0/lijasoxela.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5af0d3699---25250205693.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/vepusujat.pdfIn PDF document text
    • 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://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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 14472 bytes
SHA-256: 132d3d51e4919515bfb822d6723b3774dc22a0827fd72b9dc2451ea24b6b5466
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10956 bytes
SHA-256: 2bfc193e00f7bd0c6176d3d66e2ab91f2305beeeb951fc27c0fb7bb6ae006435

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