Malicious PDF — malware analysis report

Static analysis result for SHA-256 524cbe2094e23cb9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 19:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d85d6eef1ecfbbf6122296e96fc1ed6 SHA-1: 5a8cb8c8e5eae64d15ea77970a35b12f890ae0dd SHA-256: 524cbe2094e23cb9eef6340a33026da73a7daa9e0a432ba66dd030646836fef6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kxqcgs.com/filespath/files/20210909210307.pdf In PDF document text
    • http://crocepadrekolbe.it/userfiles/files/66997856.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/31962357344.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c8d6923c---64092047374.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9b1e59a0711ac12c04635b80ddd26058/vakawubogatufotele.pdfIn PDF document text
    • http://www.bash.cl/media/file/12057985411.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/28016418505.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139805d298fa---buvafo.pdfIn PDF document text
    • https://dukupahit.com/contents/files/9193738086.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/nulixal.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vamaxida.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/21936962590.pdfIn PDF document text
    • https://topupdana.com/contents/files/14157560640.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/22136545080.pdfIn PDF document text
    • http://allasclub.com/campannas/file/47708265179.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141903bf08a6---74464737573.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c05bd981---29421666309.pdfIn PDF document text
    • https://people11people.com/uploads/File/45272662687.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140059866db7---78318074251.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/bisomarawalumosolu.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/63771185066.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/18241497110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+movie+demon+slayerPDF 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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 18048 bytes
SHA-256: 9fbe7d6d3cea9b32635b843cd5d9378bf0c10c4c58118b91321311d43e7fd71c
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10560 bytes
SHA-256: 9d9d731e0af43edc4b5de21811fe764f7819108dab4f913b72e062b3551a4d2b
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1