Malicious PDF — malware analysis report

Static analysis result for SHA-256 8057fb3f8df64006…

MALICIOUS

PDF

96.9 KB Created: 2021-07-13 21:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b04f1c89135c8e0d92ae969bd33a2e58 SHA-1: ec514aeba9469ad3198a9dd95d7f5c90f4ffb6c4 SHA-256: 8057fb3f8df64006b330d02f3b0d796ccaea9640fe5b78f326cd864de84cc292
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs, such as 'https://allytemp.ru/uplcv?utm_term=technical+project+manager+interview+questions', are likely used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=technical+project+manager+interview+questions PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a352f4f9---gesusubuwovidizozem.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/85119452941.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s5jr708ve5iip5mvqn0ibtafb2/jitenogijetatovatabisuf.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e986a4d2---71413752766.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/15363c50655011ef267bb25fe8474c0c/63819617940.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tozuwusakokixup.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530081542.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700da6f6a---64934871120.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ct5p66k46e3gq1ufmlb6dpjkfp/81879780250.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/veporu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/779c679f5441dc8733ae18a63fece405/remojovefupetu.pdfIn PDF document text
    • http://headrepublic.pl/images/files/gebubujoxuxomazowo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ad8bb978---potaruvurefofobufev.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c66dc3vko719itl21143bnjl1p/45769043267.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9482a7d5f2418238481736dc6a29935b/58282000218.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a4b045ee55d007f4a522773a3093c1e9/jemedu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084196c85081---29004591929.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d29641cb893---51272023963.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b84ktlpc77j5hmbmhfv0t706l0/84338533227.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/34506b97bd874159c4dcce36af78f5f5/suxixoxogojugubexufoxoxek.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/156b571908e3334f0d21a7515b877771/fupatixusafuvivobezolaka.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/xufikuzaxog.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://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_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16716 bytes
SHA-256: ce5083953cab73f6a77e149b060431071ebffb3db644a9a576d9176979d4f83f
font_01_sfnt_off000143e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 11312 bytes
SHA-256: c72f453ed8cfff42617191f84698e68d3aad47e3960f909bf95c43f225e8a251
font_02_sfnt_off00015e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.