Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecf7715b9ec18b4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 05:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e28e81b478bfa7b03e398152cd13cbf7 SHA-1: 7177a5ec7431b364d12b298493bc2b9d62815597 SHA-256: 1ecf7715b9ec18b415df3fe364f94e9d258a767cdf416c7edab8c321b9a75d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, a common tactic for phishing or distributing further malware. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://28777886.com/Lpf/UPFILE/userfiles/files/xojekebozifagutadu.pdf In PDF document text
    • https://mimpishio1.com/contents//files/rorowisagojapi.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/11025976783.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84304321649.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/27936028720.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522001906.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/36346634044.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wejunefawamarujufo.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9a4f07faf6cd7f55f80b046a92fc40ce/82104696121.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/86782654502.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sekoko.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vtuv647so4rombfh8omkt28jh7/29298929800.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/69450399650.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/db94379914a3bc89a29e5210a1dd4b8e/55310115988.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/vivetenurexuziwizuwo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7tuj9rl2lt9tq26fp4k8dfhu04/nazigumedari.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bakukogemajamuguzudola.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/pidelolexexepuvaliver.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/72bf1b57c2f44585a70234324b54f1c1/winebepikikarunolof.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/76661329749.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160901d701237c---32062052320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=le+verbe+%C3%AAtre+conjugaison+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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 11300 bytes
SHA-256: be38b2a7765e486ee2eb82f8bb7fc391ef9058b4f285326498978cf0f3ae290a
font_01_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 21248 bytes
SHA-256: c358f0a973eb833ea22919c8099e96c801839e3bf27c6a7e8590f3c20ffa2616