Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1efa5ea679f1c0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 12:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4331cc2a5f8c4aa871821afdbee69752 SHA-1: edda62b0a8cd952a65e730a2e00dc5ac9ed98093 SHA-256: 1e1efa5ea679f1c0054e21d8cc89520be543804752f4b430456f1d80b4c63fe9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=how+can+i+earn+free+robux PDF link annotation
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/76445685720.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • http://cmtsport.com/pliki/lefegujijudobilunitaxozal.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210907150046_na5gy6.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/74121023784.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/88470382808.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/putonobupekanin.pdfIn PDF document text
    • http://aweibel.com/Photo/file/maxezupuzufizovo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141632fbedcd---jetoxikan.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pegolo.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/60650328548.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/32450980649.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/69037063105.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/33087657253.pdfIn PDF document text
    • http://renknh.com/ckupload/files/26021365461.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4aa41d779ec1fc243932f55350a1ca2a/48680103639.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/xefiwipunuzanalix.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/vijipeximujivisorikir.pdfIn PDF document text
    • http://pi-consulting.ch/download/45303710052.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/vawomifurunepile.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/64604019754.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c5c5fbee3825443c4e13d7f90b99f4b2/xesudugegakogokozo.pdfIn PDF document text
    • http://moretonassets.net/userfiles/68282680445.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/vuxewu.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_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 18448 bytes
SHA-256: 5fa8fbbcead9002a3a010e576821f7cad74a22e277297f7992235a66527c1512
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 10436 bytes
SHA-256: 830747fad1e124fddad3c717f18fc721accb59940df09c654a45f8c7a86054bf
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1