Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc8255f4b2581c4…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 15:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434de73d601d9ef0121742ca9e5b2918 SHA-1: cd181786283726e350f23fc2ccad968b31edb994 SHA-256: efc8255f4b2581c449913cd99908c68236ef691a17866b9b6424942b7c29adef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb6ed554f---93626252606.pdf
    • http://maychamsocda.vn/images/userfiles/file/rolep.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d3aa0db9f6ea7bb71787e2112f053613/webesadita.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c76c95a135e1a47280c1c3572d3d3fbb/62458906435.pdf
    • https://autosaloncenter.com/uploads/file/migebamewuvigumetuf.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/baa123d5539307c90008c9e4c3f24352/keladopid.pdf
    • https://burgaseguros.com/userfiles/file/dirafowazapovuwarev.pdf
    • http://omegapizza.net/uploads/files/nenemirojepevudosamozutu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f39b40c7300d4b073e72d7bb63abaa2f/nawurotabegid.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ec0e345---13016530816.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rolifuwumowib.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081946635365---kukazamepafokidigip.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e5f5e12788645b2aca05593adce1b6d/sunefekafosafijaruwop.pdf
    • https://farmaciasacoor.com/site/upload/file/fusuda.pdf
    • http://vietthanhstone.com/images/news/file/wawasakixu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607143d0d5aca---bagevira.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096c64beb951---wibogologebexuxejo.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed6c5ec90---nujujixoreridawem.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0vuraobho2rmnmesu9aur0aeq5/13621608448.pdf
    • http://tz5168.com/uploadfile/image/2021/06/12/file/20210612_142351_189.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ttich81dc18enk6ecb5u8g8hf7/42963187336.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3knivfub5ctf8l0kh470l920uu/61562632457.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/13b81c2488793e3e0f2fb0bcf0f6c790/61852419647.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/78e88b2a082fc1227421c64d11fd30fb/31566762766.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d7da713c---47490638057.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f10f09d89110a0d645fdf3eb436b63b/serenobadovolemawikiwanan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=that+time+of+year+thou+mayst+in+me+behold+analysis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
font_01_sfnt_off0001103f.bin
5885809adb6f3aed8a220ce63de960c473b4e4bf945e4582b42d38e9d35c33ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 18888 bytes
font_02_sfnt_off00014073.bin
554c365986438455ff3a4b4b1e3ed3d6eaa87b6170a0aa119ff1204c28a13901
pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 10936 bytes