Malicious PDF — malware analysis report

Static analysis result for SHA-256 0035ce31321e5903…

MALICIOUS

PDF

67.3 KB Created: 2021-09-30 17:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2511b04b73b0fdb70152fef64edc9cc2 SHA-1: 11c9d37991a4f686a8c6398a56f193cebdeea7d3 SHA-256: 0035ce31321e5903fd9c0e195bb359af6c12ffd90b6f305fc53406b25c09fb67
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://htbestcomputer.com/media/ftp/file/59954486032.pdf In PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/wewibaxopijuwivukefatux.pdfIn PDF document text
    • https://cooperspick.com/files/bazuka.pdfIn PDF document text
    • http://hingliltd.com/userfiles/pubafovav.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/11472869185.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a579475a5---14527588786.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/fanibemipa.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/mebuvopim.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e97fc5ec97738c2a0bbc895213fde62/42403088860.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091617230173499.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/95601769283.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210923143641.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lebeliregejafazolupu.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/xuxoligutepokavakuviv.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/modenonibizupuwika.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/69223714777.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/83899831127.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/19bb18cb915cbc8c0c0a914c3dd90e69/24360409078.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d5ded0a4c---kikuluvexaxekubo.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/jofejanegobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+emerald+mystic+ticketPDF 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_off0000abe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 10736 bytes
SHA-256: 9a8ff727c42b2a8b385c5c734d5390468dcdfa8d623c6026ba70fc6b91c6ec6e
font_02_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 14104 bytes
SHA-256: 218f010579648b18de9216080713ab7a59f267105594709472cb723a55630124

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