Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c05788db49851…

MALICIOUS

PDF

97.7 KB Created: 2021-06-17 12:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 105ef04d28f19827c3d381aa70af2ebb SHA-1: 5afd535fedd80f10e159bce27a1309745a8a79d6 SHA-256: 995c05788db4985116f84712a13bab42bea609ef87cc8e5d4d480036e90e29ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'mod menu download' lure in the URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=outwitt+mod+menu+evil+nun+download
    • https://waelfawzy.com/userfiles/file/
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91fa81308---55401389045.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/43089115471.pdf
    • http://littlepearlbooks.in/data/eimages/file/buvekudusuwuwapawedififa.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a3e25562b82c128c5501c33e2f525aa0/ravovenamadopar.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2cf1gjqg0ntohbkngqov6gdjg6/bowitunajorivinofi.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec341917e---12784861582.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/36001273946.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c4ed8ee5---motojagede.pdf
    • http://rolmech-strzelno.pl/Upload/file/lolot.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/55980133893.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a94859245---58491912722.pdf
    • https://irrisyst.eu/files/file/limuzelekilaxad.pdf
    • http://secohthailand.com/file_media/file_image/file/tuzisixolewuvawuv.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/646ejogjq7lf5v6iu2m2n2gvlq/84201497430.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/075d5c779a132b9a653ec9206c77962e/zofafewi.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1bb65617f1094629d74558c1f33ba674/6754153222.pdf
    • http://nuovojob.com/userfiles/files/pikajofuzotexoxifo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f957c50ed---32541874538.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010448.bin
b6599412387a5302b1d9533d44b81d4b72af897791fedb4e802daef711844faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 4756 bytes
font_01_sfnt_off00011468.bin
db1b317c4656ed706161df9dd224fb78bf6358133793e493a9625c5baf418965
pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 3796 bytes
font_02_sfnt_off00012080.bin
b619ae4067b2eb9909d41822634e37829854a0efa545807748e13dbfc800da75
pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 23088 bytes
font_03_sfnt_off00015389.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443
pdf-font-stream PDF embedded font (sfnt) at offset 0x15389 16168 bytes
font_04_sfnt_off0001688e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1688E 4324 bytes