Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ce8f85153dc46…

MALICIOUS

PDF

88.8 KB Created: 2021-08-19 16:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41fa24b9f90012f22b95401032086409 SHA-1: 139d32171cc36c2e5135c56f005e8fd76f636f76 SHA-256: 2e5ce8f85153dc4656e101de74b3432eb84b5f9297324c2883133b47e23d41ce
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of 'cmd0u1otiu' in the document text, alongside URLs, points towards attempts to execute commands or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06606e64cf---zobenoxusozopegurapuxubi.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e99d08b87---10124636993.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/94678227685.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7092c5de---ditiwunudapisapijazewibor.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rubuxesam.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/18dd8fd7c7b93c5edbfe656f4c61091e/24810211783.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/50537647670.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab443b697553242a155fea6acd867778/50374819820.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/kokoduwurewut.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/gigegomimajakesofap.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xexoxagonakuken.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74042110547.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13d04961e0ca24b762bb45088ac29524/goziveximaruxirasuwu.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/wupupotisujomuxuko.pdfIn PDF document text
    • https://renault-service.com/userfiles/89707976426.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/4501822636.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dccibbc2eerfkf61cmd0u1otiu/21080025226.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c035a6011---rubisuxogu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/30207944870.pdfIn macro / runtime command snippet
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608425d3696fd---sozebewuluwebimafon.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/66679644583.pdfIn PDF document text
    • https://vestol.bg/files/file/15611960556.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd372d57109274276a621629ac3893dd/xomupedijixunigi.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/97614257821.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bf34174848712baf5e0b48eddc026f98/nogujipunudufevevejenen.pdfIn PDF document text
    • https://www.certificagreen.com/wpIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+a+win+strategyPDF 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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 16560 bytes
SHA-256: 3134736bff3a382c77f18ec327e83d316b06cec0edadb22f80a0a802b17f0f37
font_01_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10428 bytes
SHA-256: 92c276992619bbd79adcbc13123aa45167759ed8b575436236fa47aae9661070
font_02_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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